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The Southeastern Anatolia Project (Turkish: Güneydoğu Anadolu Projesi, GAP) is a multi-sector integrated regional development project based on the concept of sustainable development for the 9 million people (2023) living in the Southeastern Anatolia region of Turkey. According to the Southeastern Anatolia Project Regional Development Administration, the aim of the GAP is to eliminate regional development disparities by raising incomes and living standards and to contribute to the national development targets of social stability and economic growth by enhancing the productive and employment generating capacity of the rural sector.The Southeastern Anatolia Region extending over wide plains in the Euphrates-Tigris Basin encompass the administrative provinces of ( Adıyaman, Batman, Diyarbakır, Gaziantep, Kilis, Siirt, Şanlıurfa, Şırnak and Mardin )which are located in the basins of the Euphrates and Tigris and in Upper Mesopotamia. The surface area of the region bordering with Syria to the south and with Iraq to the southeast is 75,193 square kilometres which corresponds to 9.7% of Turkey's total surface area.[1] Turkey has in total 8.5 million hectares of irrigable land and GAP's share in this total is 20 per cent.The total cost of the project is over 190 billion Turkish lira (TL) (2020 adjusted price).[2]

Current activities under GAP include sectors like agriculture and irrigation, hydroelectric power production, urban and rural infrastructure, forestry, education and health. Water resources development envisaged the construction of 22 dams and 19 power plants.[3]

History

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Logo of GAP

The initial idea and decision to utilize the waters of the Euphrates and Tigris rivers came from Atatürk, the founder of the Republic. During the one party era, the need for electrical energy was a priority issue. The Electricity Studies Administration was founded in 1936 to investigate how rivers in the country could be utilized for energy production. The Administration began its detailed studies with the "Keban Dam Project" and established observation stations to assess the flow and other characteristics of the Euphrates. The GAP as it is structured today, was planned in the 1970s consisting of projects for irrigation and hydraulic energy production on the Euphrates and Tigris, but transformed into a multi-sector social and economic development program for the region in the early 80s. The development program encompassed such sectors as irrigation, hydraulic energy, agriculture, rural and urban infrastructure, forestry, education and health. With the development of new GAP Administrative structure in 1988–1989, its basic objectives included the improvement of living standards and income levels of people so as to eliminate regional development disparities (economic inequality) and contributing to national goals such as social stability and economic growth by enhancing productivity and employment opportunities in the rural sector.[4]

Location of GAP

Tensions between Turkey, Syria and Iraq were raised from time to time due to GAP. Syria and Iraq demanded more water to be released, while Turkey declined so as to form the dam reservoirs. Because of this GAP is one of the world's most well protected dam projects, especially against aircraft. GAP also almost came to a complete halt in the early 1990s due to the high level of Kurdish (PKK) activities in the region. The PKK is not only blamed for a number of funding cuts as funds were diverted to support the counter-terrorism effort, but is also blamed for damaging several dams and canals, as well as killing engineers working at the dams. A number of economic crises also played a very important part in the delays of GAP.

The UN embargo on Iraq (which was lifted after the Second Gulf War) had negative effects on development efforts and region's trade with Middle Eastern countries, which are its natural economic partners. Furthermore, imbalances in public financing delayed the financing needs of the project. Finally, a number of judicial questions needed clearing over the flooding of several historical sites as well as local residences as described in the "Social effect" section.

Strategic goal

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Historically, Southeastern Anatolia was located on the trading route between East and West. The region had been an important source of cultural diversity. However the changes in the trading routes and the agricultural methods ended the old importance of the region.

  • Irrigation in Harran
    Irrigation in Harran
  • Well and a girl
    Well and a girl

The 1989 Master Plan had aimed to initiate the revitalization of the economic, social and cultural life in the region through an "integrated regional development project". The rise in the income of the region was directly transferred to restoration and revitalization of the cultural activities in the region, instead of moving into the national budget. This master plan did not reach its goals because of the issues stated under the introduction section. However, for this negative perspective, with the international community involvement, project added new dimensions and concepts to the definitions.

The concerns and concepts of the environment, sustainability and participation, which were either overlooked or totally absent in the original plan has been added with the UNDP support. The revised "GAP Regional Development Plan" with a new understanding is currently in place. The macro frame of the GAP Regional Development Plan (GAP-RDP) is drawn by 8th Five-Year Development Plan coordinated with the efforts under the "Program for Transition to a Strengthened Economy" prepared as a part of the process for Turkey's accession to the European Union.

Social effect

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The project rests upon the philosophy of sustainable human development, which aims to create an environment in which future generations can benefit and develop. The basic strategies of the project include fairness in development, participation, environmental protection, jobs creation, spatial planning and infrastructure development. In reaching these goals the primary objective of GAP is to normalize levels of development, income, and living standards between the southeastern region and other regions of Turkey. GAP is transforming the region completely by creating economic and social opportunities and promoting business. Critical infrastructure, such as airports and highways, is being constructed to support the development of the region. GAP will provide jobs to an estimated 3.5 million people directly.

Economic development

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Irrigation

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GAP is estimated to double Turkey's irrigable farmland. The increase of agricultural activity of GAP in its incomplete state is visible clearly on the USDA graph belove. Cotton production increased from 150,000 metric tons to 400,000 metric tons, making the region the top cotton producer. But at the same time other regions declined, which means that Turkey's overall output stayed relatively steady.

  • Cotton production
    Cotton production
  • Cotton regions
    Cotton regions
  • Locations of Dams
    Locations of Dams
  • Plains irrigated by the tunnels
    Plains irrigated by the tunnels

GAP is supposed to create 17,000 square kilometres (4.2 million acres) of farmland in the Harran plain alone, as visible on two USDA maps above.

Reports indicate that, due to irrigation from the Atatürk Dam, harvest yields of cotton, wheat, barley, lentils, and other grains in the Harran plain have tripled. A number of Agriculture Department backed initiatives are encouraging farmers to experiment with new varieties of fruits, vegetables, and nuts that did not exist in the region prior.

Imports and exports

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The amount of foreign trade of the region is continuously rising since 2002. In 2002, total export from the region was 689 million $ and total imports stood at 773 million $.According to TÜİK data, GAP's total exports are In 2023, total reached 13.657 billion $, while imports reached 9.330 billion $. Since 2004 the G.A.P. region is net exporter.[5]

Fishing

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GAP is being built in a region where water used to be a scarcity. With the vast number of lakes being formed, plans to use them as breeding spaces for commercial fishing are also underway. In the case of the Atatürk Dam the fishing industry in the region is already developing.

Power

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The GAP also consists of 19 hydroelectric power plants. These will supply the energy equivalent of 22% of the anticipated total nationwide energy consumption in 2010. Providing 8,900 gigawatt hours (32 PJ), it is one of the largest series of hydroelectric power plants in the world.

Physical Realization of Energy Projects as of October 2024[6]
Name Inst Capacity (MW) Energy Prod (GWh/yr) Status
Karakaya Dam & HEPP 1,800 7,354 In operation since 1987
Atatürk Dam & HEPP 2,400 8,900 In operation since 1993
Karkamış Dam & HEPP 189 652 In operation since 1999
Birecik Dam & HEPP 672 2,516 In operation since 2000
Şanlıurfa HEPP 51 124 In operation since 2006
Erkenek HEPP 13 52 In operation since 2010
Sırımtaş Dam & HEPP 27 80 In operation since 2013
Koçali Dam & HEPP 39 136 Under construction
Büyükçay Dam & HEPP 30 84 Master Plan
Kahta Dam & HEPP 75 71 Master Plan
Fatopaşa HEPP 22 32 Master Plan
Çağçağ HEPP 14 42 In operation since 1968
Bulam HEPP 7 33 In operation since 2010
Euphrates Basin 5,339 20,076
Dicle Dam & HEPP 110 298 In operation since 1999
Kralkızı Dam & HEPP 94 146 In operation since 1998
Batman Dam & HEPP 198 483 In operation since 2003
Garzan Dam & HEPP 52 158 In operation since 2013
Ilısu Dam & HEPP 1,200 3,833 In operation since 2020
Silvan Dam & HEPP 160 623 Under construction
Cizre Dam & HEPP 240 1,208 Under construction
Kayser Dam & HEPP 90 341 Final Project
Tigris Basin 2,144 7,090
Total 7,483 27,166

Infrastructure

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Dams

[edit]
Centerpiece of the project: Atatürk Dam

Southeastern Anatolia Project consists of 22 Dams (year of completion):

Euphrates Basin
  1. Atatürk Dam (1992)
  2. Birecik Dam (2000)
  3. Büyükçay Dam
  4. Çamgazi Dam (1998)
  5. Çetintepe Dam (2023)
  6. Gömikan Dam
  7. Hancağız Dam (1988)
  8. Kahta Dam
  9. Karakaya Dam (1987)
  10. Karkamış Dam (1999)
  11. Kayacık Dam (2005)
  12. Kemlin Dam
  13. Koçali Dam
  14. Sırımtaş Dam (2013)
Tigris Basin
  1. Batman Dam (1998)
  2. Cizre Dam
  3. Dicle Dam (1997)
  4. Garzan Dam (2012)
  5. Kayser Dam
  6. Kralkızı Dam (1997)
  7. Ilısu Dam (2020)
  8. Silvan Dam

Maintenance

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The reason for the sheer number of dams in the project, more than would at first appear needed, is maintenance. Dams need to be cleaned from the debris carried with the water flow. After a while the dam becomes obsolete as water flow slows down to inadequate levels. The dams will be shut down every 5 to 10 years for fall maintenance (also called fall cleanup). Water levels are normally lowest in fall. The extra dams are placed in service during this maintenance period.

In cases of natural disasters such as floods, the maintenance may be performed earlier. The plan is to have one or two dams spare in case an emergency shutdown of any dam is necessary. While shutting down a dam also shuts down irrigation channels linked to it, it can nevertheless continue providing power.

Engineering behind the project

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Atatürk Dam

Providing electricity and irrigation is challenging in a region as large as the one targeted by GAP. A constant flow of water is imperative.

Energy dissipator

After a large body of water is collected behind the dam a constant flow of water is then available. The height of the dam allows the water to go at a high velocity through the turbines thus generating electricity. After the fast flowing water exits the dam it is slowed down by a concrete energy dissipator (pictured). Creation of electricity is only part of the usage of the tons of water collected at the dam.

Radial floodgates

When dealing with tons of water, it has to be distributed evenly and slowly. Occasionally main channels will need maintenance, or may be damaged due to external reasons. In order to even assess the problem, tons of water need to be removed from the main channel. The best way to do this is to slow the overall flow from the main dam and redirect all water flowing originally through the damaged channel to backup channels. Radial gates serve this purpose, they regulate the flow of water. It is imperative to keep water flowing. Lack of the flow will not only compromise all irrigation linked to that channel but also all cities linked will experience a power outage.

Harran main channel

After leaving the energy dissipator, water flows into a set of main channels, which flow in different directions supplying water to a greater area. They are the most critical part of a dam project aside from the dam itself. This is as critical as high-voltage transmission lines in power grids.

Sluice gates

Sluice gates regulate the flow of water. If water flows too fast it will overflow and probably damage one or more of the channels, or flood irrigation fields. Multiple sluice gates regulate the speed of the flow on different sections of the channel. They can also be used like radial gates to cut water in channels.

  • Harran canal
    Harran canal
  • Flow regulator
    Flow regulator
  • Distribution canals
    Distribution canals

After leaving the radial gates on the main channel, water flows to canals which are smaller and can carry less water. Flow regulators divert water on canals to distribution canals. Just like radial gates and sluice gates, flow generators can stop water flow if necessary. Distribution canals are the last step as far as engineers are concerned. It delivers water to different sections of large fields, pretty much an artificial river.

  • Earth distribution channel
    Earth distribution channel
  • Furrow
    Furrow
  • Drip tubes
    Drip tubes

It is up to farmers to get the water from distribution channels to their crops for irrigation. There are different methods to do this; any one or a combination of earth distribution channel, furrow, and drip tubes can be used.

Sub-projects

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The latest design of the project divides the GAP into smaller projects. Each project generates its own annual reports and activity sheets.

  • Management, Operation and Maintenance of GAP Irrigation Systems (GAP-MOM),
  • Regulation of Water in Irrigation Canals and Methods and Technologies for Water Saving,
  • Treatment of Urban Waste Water,
  • Re-use of Irrigation Discharge Water,
  • Protection of Biological Diversity,
  • Environmental Work in the GAP Region,
  • Environmental Work in the GAP Region — Tigris Basin,
  • Assessment of Climatic Conditions in the Region for Present Day and Future,
  • Adıyaman-Kuyulu Region Erosion Control Project,
  • Adıyaman-Diran Micro-Catchment Rehabilitation Project,
  • GAP Afforestation Project,
  • Participation in urban planning and zoning,
  • Resettlement and employment of people affected by dam lakes,
  • Atatürk Dam Lake Sub-Regional Development Plan,
  • Eco-city and eco-village planning and development in pilot localities.
  • Establishment of Multi-Purpose Community Centers (ÇATOM) for Women,
  • Improving the Income Level of People in Non-Irrigated Areas,
  • GAP Entrepreneur Support and Guidance Centers (GAP-GIDEM),
  • Project for On-Contract Animal Husbandry (GAP Rings Model),
  • Project for Joint Machinery Use (GAP OMAK),
  • Sub-Regional Development Plan Comprising Return to Villages and Rehabilitation,
  • Project for the Rehabilitation of Children Working in Streets.
  • Institutional Capacity Building,
  • Training and Extension Services for Farmers,
  • Land Consolidation,
  • Social Progress for Youth,
  • GAP Region Public Health Project.

Status of GAP

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The water resources development component of the program envisages the construction of 22 dams and 19 hydraulic power plants and irrigation of 17,000 square kilometres of land. The total cost of the project is estimated at $32 billion USD. The total installed capacity of power plants is 7483 MW and projected annual energy production reaches 27 billion kWh.[7]

Status of the project
Completed Ongoing Planned
Power capacity as of December 2023
MW 		6,827 160 496
Power production as of December 2023
GWh/yr 		24,671 623 1,872
Irrigation area as of December 2023
km2 		663,919 94,701 299,183
Number of dams 13 5 4
Number of hydropower plants 14 1 6

GAP contributes to the country's hydroelectric energy production. As of 2023, 91.2% physical realization of energy investments was achieved.The amount of government investment for 2023 was around 84 billion TL, which corresponds to 18.6% of Turkey's total investment for same year.[8]

Criticism of the project

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Ilısu Dam

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Completion of the Ilısu Dam would cause the flooding of the ancient city of Hasankeyf whose history stretches back over 10,000 years. Between 50 and 68 hamlets and villages will be flooded affecting approximately 25,000 local people. An additional 57 villages will have their land partially flooded.

Construction began on August 5, 2006, after a ceremony led by Prime Minister Recep Tayyip Erdoğan.[9] The dam entered into service in 2018.

Archaeological losses

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Critics of the project say that the dam could effectively destroy the artifacts of ancient Kurdish, Armenian, and Assyrian habitation in the region.[10]

Environmental justice concerns

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The environmental justice lens of the human-environment geography should determine a fair distribution of environmental benefits and burdens, especially with regard to vulnerable communities. In context of the Ilisu Dam environmental justice focuses attention on the fair treatment of different social groups and the potentially disproportionate impact of these projects on specific communities.[11]

Environmental justice, for example, would highlight how dam construction can disproportionately affect certain communities, perhaps leading to the displacement of indigenous or economically disadvantaged groups as occurred recently in Hasankeyf.[when?] It prompts us to ask whether the benefits of hydropower and economic development are distributed fairly to all communities or whether certain groups are hit hardest by the negative impacts, such as loss of land, cultural heritage or livelihoods.[12]

TRT GAP

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TRT GAP, belonging to the Turkish Radio and Television Corporation, was established in 1989 to promote the Southeastern Anatolia Project in the region. In 1991, TRT GAP was put under the jurisdiction of TRT's Ankara facilities.[13] From 1989 to 2001 TRT GAP was broadcasting on TRT 2 before being revamped as a 24-hour news and culturally-oriented channel. TRT GAP's transmissions are realized through the same channel with the TRT 3 since 2001 (which broadcasts live footage of TBMM TV) on a time-share basis.

Key Information

See also

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[edit]

References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Southeastern Anatolia Project

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The Southeastern Anatolia Project (GAP; Turkish: Güneydoğu Anadolu Projesi) is Turkey's largest and most ambitious integrated regional development initiative, spanning nine provinces—Adıyaman, Batman, Diyarbakır, Gaziantep, Kilis, Mardin, Siirt, Şanlıurfa, and Şırnak—in the Euphrates-Tigris basin, with components including 22 dams, 19 hydroelectric power plants, and infrastructure designed to service 1.8 million hectares of land for sustainable economic advancement through water resource utilization. Launched conceptually in the as a multi-sectoral effort encompassing , , , , and , GAP targets the generation of 7,476 MW of installed hydroelectric capacity yielding 27 billion kWh annually, alongside transforming arid southeastern landscapes into fertile agricultural zones to elevate productivity, employment, and while mitigating interregional economic gaps. Key achievements encompass the operationalization of major facilities such as the Atatürk and Karakaya dams, which have cumulatively produced substantial —exceeding 175 billion kWh historically—and facilitated expansions that have boosted crop yields in and grains, though realization trails energy components, with ongoing investments addressing infrastructure and social development. The project has encountered disputes with downstream nations and over Euphrates-Tigris flow reductions, alongside domestic critiques regarding population displacements and ecological alterations in the Kurdish-majority area, yet empirical outcomes underscore enhanced regional GDP contributions and energy self-sufficiency, countering narratives from sources often aligned with separatist or riparian adversarial interests.

Historical Development

Inception and Early Planning

The Southeastern Anatolia Project (GAP) was conceived in the as a coordinated program to exploit the water and land resources of Turkey's southeastern region, particularly the and river basins. Initial efforts built on earlier isolated hydraulic developments, such as feasibility studies and construction starts for dams like Keban in the mid-1960s, but lacked an integrated framework until the decade's planning phase. The project's core rationale centered on addressing chronic underdevelopment in the area, characterized by low agricultural yields due to arid conditions and limited irrigation, alongside insufficient energy infrastructure to support national growth. In 1977, ongoing proposals for and schemes across the two basins were formally bundled and named the Southeastern Anatolia Project, marking its official inception as a unified initiative. This consolidation occurred under the State Hydraulic Works (DSI), Turkey's primary agency for , which outlined a scope encompassing 22 dams and 19 hydroelectric power plants. Early blueprints targeted of 1.8 million hectares of to enable year-round farming, primarily for crops suited to the , while prioritizing generation with a projected installed capacity of 7,476 megawatts and annual output of 27 billion kilowatt-hours. These targets reflected a technocratic emphasis on to elevate regional , which lagged significantly behind national averages, and to mitigate east-west economic disparities without broader social components at the outset. Planning documents from the period stressed engineering feasibility over geopolitical implications, though downstream riparian concerns from and were noted in preliminary assessments. Funding was envisioned through state budgets and international loans, with construction sequencing favoring upstream facilities to maximize storage and flow regulation. By the late 1970s, pilot elements like the Şanlıurfa Tunnels' foundations underscored momentum, yet the framework remained narrowly hydraulic, evolving only later toward multisectoral integration.

Master Plan Formulation and Initial Implementation

The Southeastern Anatolia Project (GAP) was initially conceived in the as a development program targeting the and basins, with plans for 22 dams, 19 hydroelectric power plants generating 7,476 MW and 27 billion kWh annually, and across 1.8 million hectares of land. This phase emphasized harnessing hydraulic potential for energy and agriculture in the underdeveloped southeastern region of Turkey. By the late 1980s, the project evolved into a multi-sectoral initiative incorporating social, economic, and infrastructural dimensions beyond mere water management. The GAP Master Plan, prepared in 1989 by the State Planning Organization in collaboration with consultants such as Nippon Koei and , established a framework for sustainable , including timelines for resource utilization, agricultural modernization, and investments. The plan projected total investments exceeding $32 billion (in 1989 dollars) across , , urban infrastructure, , and sectors to address chronic underdevelopment. In parallel, the GAP Regional Development Administration was formed in 1989 to centralize coordination, budgeting, and execution, shifting from fragmented ministry-led efforts to unified oversight. Initial implementation focused on priority hydropower infrastructure to generate early economic returns and enable downstream irrigation. Construction of the Karakaya Dam on the began in 1976—prior to the formal master plan but integrated into GAP—and concluded in 1987, yielding 1,800 MW capacity as the second-largest facility in the chain. The Atatürk Dam, GAP's flagship structure, saw groundbreaking in 1983, with reservoir filling commencing in 1990 and full hydroelectric operations by 1993, providing 2,400 MW and foundational storage for regional water allocation. These early dams prioritized upstream energy production, supplying power to national grids while laying groundwork for expansive irrigation networks, though progress was tempered by technical challenges and regional security issues. By the early 1990s, these efforts had realized over 20% of planned hydropower capacity, marking the transition from planning to tangible infrastructure deployment.

Strategic Objectives

Economic and Agricultural Targets

The primary agricultural target of the Southeastern Anatolia Project (GAP) is to bring 1.8 million hectares of land under , primarily along the and rivers, to enable in a historically arid reliant on rain-fed . This expansion is projected to increase crop yields substantially, with estimates including 104% for , 69% for , 388% for , and 556% for tomatoes, shifting production toward higher-value and export-oriented crops like and supporting agro-industrial inputs. Diversification of farming activities beyond traditional grains is emphasized to enhance productivity and provide raw materials for downstream manufacturing, such as textiles from increased output. Economically, GAP aims to elevate per capita income in the nine-province region to the national average, addressing longstanding disparities where southeastern incomes have trailed the rest of Turkey due to limited infrastructure and water scarcity. This involves boosting rural through irrigation-dependent jobs and related sectors, reducing out-migration, and fostering high-income activities to absorb urban populations and promote social stability. The project integrates these goals with national export promotion, targeting foreign exchange gains from agricultural surpluses and value-added products, while coordinating with to minimize investment inefficiencies. Quantitative benchmarks from the GAP Master Plan include making an additional 19.3% of Turkey's total irrigable land economically viable post-completion, positioning the southeast as a key contributor to national and industrial growth. These targets prioritize sustainable resource use, with on-farm development services planned for 2.4 million hectares to optimize and prevent overuse, though realization depends on phased rollout. Overall, the economic framework seeks integrated , eliminating inter-provincial inequalities through agriculture-led growth rather than isolated sectoral interventions.

Energy, Infrastructure, and Social Goals

The energy objectives of the Southeastern Anatolia Project center on exploiting the substantial potential of the and river basins to bolster Turkey's national supply. Upon full implementation, the project envisions 22 dams equipped with 19 hydroelectric power plants generating approximately 27 billion kWh annually, representing a significant share of the country's hydroelectric output and contributing to reduced reliance on imported sources. This capacity is projected to harness about 20% of Turkey's total potential concentrated in the region. Infrastructure goals encompass the construction of multi-purpose , extensive networks, and ancillary developments such as roads, railways, and urban facilities to support and economic viability. The project plans to irrigate roughly 1.8 million hectares of through canals and distribution systems, transforming arid plains into productive agricultural zones while facilitating flood control and water storage. Supporting elements include enhancements to transportation corridors and settlement , aimed at fostering connectivity between rural areas and urban centers across the nine provinces. Social aims focus on elevating living standards and mitigating regional disparities through investments in and community services, with targets to align and development indicators with national averages. Key priorities involve expanding access to , healthcare, and , alongside programs for population management, vocational , and local participation to promote sustainable human development. The GAP Social Action Plan outlines strategies in areas such as organization, health services, and social infrastructure to address underdevelopment, including initiatives like projects with explicit social dimensions.

Infrastructure and Components

Dams, Reservoirs, and Hydropower Facilities

The Southeastern Anatolia Project (GAP) includes 22 planned dams and 19 associated hydroelectric power plants (HEPPs) on the , , and their tributaries, aimed at harnessing potential estimated at 7,476 MW installed capacity and 27 billion kWh annual production. These facilities also provide storage for and flood mitigation, with total irrigable area targeted at 1.8 million hectares upon full implementation. prioritizes multi-purpose designs, integrating , arch, and rockfill structures to optimize in the arid southeast region. The Atatürk Dam, the project's flagship structure on the River between Şanlıurfa and Adıyaman provinces, exemplifies large-scale engineering with a height of 169 meters, crest length of 760 meters, and structural volume of 84.5 million cubic meters. Its holds 48.7 billion cubic meters, the sixth-largest globally by volume, enabling regulated flows downstream. The integrated HEPP features eight 300 MW Francis turbines plus a 5 MW auxiliary unit, totaling 2,405 MW, with commercial operations commencing in 1993 after impoundment began in 1990. This facility alone accounts for over 30% of GAP's target and has generated billions of kWh since activation, supporting national grid stability. On the River, the Ilısu Dam, a 131-meter-high concrete-faced rockfill structure spanning 1,775 meters, was completed in 2020 with a 1,200 MW HEPP capacity. Designed for power generation, flood control, and storage, it forms a affecting Batman, Siirt, and Şırnak provinces, though its filling has raised downstream flow concerns for . Other completed facilities include the Batman Dam (operational since 1999, 40 MW) and Kralkızı Dam (1991, 173 MW), contributing to incremental capacity buildup. As of late 2023, 18 of the 22 dams were constructed, with 14 HEPPs operational delivering 5,534 MW, representing about 74% of the target. Progress continues under the 2024-2028 GAP Action Plan, focusing on remaining structures like the and Silvan Dams to achieve full integration by 2032, amid challenges including financing and regional security. Reservoir operations emphasize seasonal filling to balance power demands and releases, with monitoring by the State Hydraulic Works (DSİ) ensuring structural integrity.

Irrigation Networks and Agricultural Systems

The irrigation networks of the Southeastern Anatolia Project deliver water from reservoirs on the Euphrates and Tigris rivers through a hierarchy of main canals, branch canals, distribution channels, and on-farm systems to support farming in the semi-arid region spanning These networks incorporate gravity-fed open canals, pumping stations for elevated terrains, and pressurized delivery for field application, with over 1.496 million meters of main canals constructed as of the end of 2023. The master plan envisions irrigating 1.8 million hectares, equivalent to approximately 12% of Turkey's total irrigable land, to transform rainfed and marginal areas into productive farmland. As of December 2024, 680,000 hectares have been opened to representing about 38% of the master plan target, with ongoing construction of networks covering an additional 94,701 hectares. Key schemes include the Plain irrigation, which utilizes the Harran main canal to supply 98,500 hectares by gravity from the Atatürk Dam reservoir; the Şanlıurfa main canal serving 43,000 hectares by gravity and 5,000 hectares by pumping; and the Batman right bank project covering 18,193 hectares. The Silvan scheme, one of the largest, targets 235,000 hectares overall, including 66,122 hectares via pumped irrigation from the Silvan Dam. Other significant areas encompass the Mardin-Ceylanpınar Plains (phased irrigation of over 66,000 hectares) and Suruç Plain extensions.
Irrigation SchemeIrrigated Area (hectares)Primary Method
Harran Plain98,500Gravity canal
Şanlıurfa Main48,000Gravity and pumping
Silvan Pumped66,122Pumping
Batman Right Bank18,193Canal
Mardin-Ceylanpınar (phased)~66,100Mixed
Agricultural systems under GAP integrate on-farm infrastructure such as land consolidation, drainage networks to prevent waterlogging and salinization, and adoption of efficient application methods including drip and low-energy precision sprinkler (LEPA) particularly for cultivation in areas like Harran. These techniques aim to raise water use efficiency from traditional surface flooding levels, enabling multiple cropping cycles per year and diversification into cash crops like and pistachios on formerly unirrigated soils. In-farm development services accompany network expansion, providing training in modern farming practices and supporting shifts from subsistence to commercial agriculture, though challenges persist in full utilization due to incomplete on-farm investments and farmer adoption rates. By 2023, operational irrigation had boosted regional crop yields, with production in GAP areas contributing significantly to national output.

Supporting Urban and Rural Developments

The Southeastern Anatolia Project (GAP) extends beyond hydraulic infrastructure to include targeted urban and rural developments that integrate transportation, housing, and s aiming to reduce regional disparities and support population resettlement and economic activity across its nine provinces. Coordinated by the GAP Regional Development Administration since its establishment in 1989, these components allocate resources to sectors such as urban infrastructure, rural electrification, and community facilities, with foreign-funded initiatives like the Development of Urban and Rural Infrastructure in the GAP Region enhancing connectivity and basic services. Urban developments prioritize improved infrastructure in key centers like Diyarbakır, Gaziantep, and Şanlıurfa, including expansions in road networks, bridges, and rail links under the GAP Regional Transportation and Infrastructural Development Project to facilitate trade and mobility. The Turkish government allocated approximately $14 billion in 2023 for GAP's completion, with portions directed toward such urban enhancements to boost real estate and economic integration. Rural initiatives emphasize sustainable settlement and service provision, including the GAP-FAO Rural Development Program, which supports agricultural communities through improved access roads, electrification, and housing adaptations. New residential areas constructed for project-related displacements incorporate energy-efficient rural dwellings tailored to arid climates, featuring passive cooling designs like thick walls and courtyard layouts to minimize operational costs. Social infrastructure in rural areas is bolstered by Multi-Purpose Community Centers (ÇATOM), operational since the , which deliver vocational literacy programs, and services to over 100,000 participants annually, primarily women, fostering local employment and self-sufficiency. These centers, integrated into the 1989 GAP Master Plan, address human development gaps by combining education with infrastructure like potable water systems and sanitation facilities.

Implementation and Progress

Phased Construction and Milestones

The construction of the Southeastern Anatolia Project (GAP) has occurred in sequential phases, prioritizing upstream dams on the Euphrates River for energy production and water regulation, followed by downstream reservoirs, Tigris basin developments, and extensive networks to support agricultural expansion. Initial efforts in the 1970s focused on feasibility and early dam builds, with the project formalized as a comprehensive initiative by the 1989 Master Plan, which integrated irrigation, and socioeconomic components across 22 planned dams and 19 hydroelectric plants. A pivotal early milestone was the completion of the Karakaya Dam in 1987, the first major GAP-associated structure on the Euphrates, which began construction in 1976 and generated 1,800 MW of power upon operation, contributing to Turkey's national grid expansion. This was followed by the Atatürk Dam, the project's centerpiece, with construction starting in 1983 and structural completion in 1990; its reservoir filling enabled irrigation for approximately 1.8 million hectares downstream while adding 2,400 MW capacity, though full hydroelectric operations extended into 1993. Subsequent phases shifted toward irrigation and Tigris developments, including the Şanlıurfa Tunnels (completed in stages from 1995 onward) to divert Euphrates water for Harran Plain agriculture, irrigating over 240,000 hectares by the early 2000s. By 2008, the GAP Action Plan marked a acceleration milestone, targeting integrated completion by emphasizing social and environmental integration alongside infrastructure, with 13 dams operational by then. Later milestones include the Ilısu Dam on the Tigris, where construction resumed in 2009 after delays and reservoir filling began in 2019, yielding 1,200 MW and supporting downstream irrigation but displacing historical sites like Hasankeyf.
Major MilestoneDateDescription
Karakaya Dam completion1987First Euphrates hydropower facility operational at 1,800 MW.
Atatürk Dam completion1990Key reservoir and 2,400 MW plant enabling large-scale irrigation.
Şanlıurfa Tunnels operational1995–2000sWater diversion for 240,000+ ha irrigation in Harran.
GAP Action Plan2008Framework for accelerated, multisectoral progress.
Ilısu Dam filling2019Tigris hydropower addition at 1,200 MW amid regional impacts.

Current Status and Completion Metrics as of 2025

As of the end of 2023, the Southeastern Anatolia Project (GAP) had achieved approximately 91% completion in its energy facilities, encompassing dams and plants, while irrigation projects stood at around 60% completion. The project's component includes 22 planned dams and 19 hydroelectric power plants (HEPPs), with 18 dams constructed and 14 HEPPs operational, yielding an installed capacity of 5,534 MW against a target of 7,490 MW. These facilities have enabled significant contributing to Turkey's national grid, though full utilization depends on water inflows and operational efficiencies. Irrigation development, a core objective for expanding agricultural land in the Euphrates-Tigris basin, has progressed more slowly. Of the master plan's target to irrigate 1.8 million hectares, 663,919 hectares had been opened to irrigation by the end of 2023, representing operational networks in key areas like the Harran Plain. Construction of main canals totaled 1,496,265 meters, with an additional 94,701 hectares under active network development and 299,193 hectares planned. This equates to 62.8% of irrigation projects being operational under the GAP Action Plan, though actual cultivated area lags due to on-farm investment needs and water distribution challenges.
ComponentTargetAchieved (as of end-2023)Completion Rate
Dams2218 constructed~82%
HEPPs1914 operational~74%
Installed Capacity (MW)7,4905,534~74%
Irrigated Area (ha)1,800,000663,919 opened~37% (area); 60-63% (projects)
In December 2024, the Turkish government launched a new GAP Action Plan for 2024-2028, aiming to accelerate remaining infrastructure, enhance water management, and integrate post-earthquake recovery efforts in the region, though specific interim metrics for 2025 remain pending official updates from the State Hydraulic Works (DSİ). Progress continues to be constrained by funding allocation, technical complexities in remaining sites like the Ilısu Dam's full optimization, and regional security factors, with energy output proving more resilient to these issues than irrigation expansion.

Economic Impacts

Agricultural Productivity and Regional Trade

The Southeastern Anatolia Project's irrigation infrastructure has markedly enhanced agricultural productivity by expanding access to water for farming in a historically arid region, where dryland agriculture previously dominated 85% of the 3.2 million hectares of agricultural land. Upon fuller implementation, the project targets irrigating 1.8 million hectares, facilitating higher yields of water-intensive crops such as cotton, wheat, and pistachios; for instance, completion of key phases has positioned the GAP region as a primary contributor to Turkey's cotton production, with projected increases in the value of cotton and textile output by 2.3 times in affected areas. Recent government initiatives, including a December 2024 action plan allocating 214 billion Turkish liras to irrigation, aim to bring an additional 475,000 hectares under cultivation, further amplifying output through modern techniques like drip irrigation and crop diversification. This surge in productivity has stimulated regional trade by enabling surplus production for domestic and international markets, with agricultural exports from GAP provinces demonstrating substantial growth—from $585 million in 2002 to $3.864 billion in 2009—elevating the region's share in Turkey's total exports from 2.3% to 3.03%. The emphasis on high-value crops and agro-processing has fostered value chain development, including organic agriculture clusters initiated around 2025, which promote sustainable exports and international cooperation. Overall, agriculture accounts for nearly 40% of the region's gross regional product and over 9% of Turkey's national agricultural value added, driving economic multipliers into non-agricultural sectors like food processing and logistics.

Hydropower Output and Energy Contributions

The hydropower component of the Southeastern Anatolia Project encompasses 19 planned hydroelectric power plants associated with 22 dams, designed to deliver a total installed capacity of 7,476 MW and an annual energy production of 27 billion kilowatt-hours upon completion. This output is projected to constitute approximately 10.9% of Turkey's total hydropower potential, leveraging the Euphrates and Tigris river basins for renewable electricity generation. Major operational facilities drive current contributions, including the Atatürk Dam and Hydroelectric Power Plant, which features an installed capacity of 2,405 MW across eight 300 MW turbines and one 5 MW auxiliary unit, generating about 8.5 billion kWh annually. Other key plants, such as Karakaya (1,800 MW, operational since 1987) and Birecik (672 MW), further bolster output, with seven operational plants collectively accounting for roughly one-third of Turkey's national production as of assessments in the late As of 2024, Turkey's overall hydroelectric generation reached 73.1 TWh, with GAP facilities contributing a substantial but variable share influenced by water availability and project realization rates exceeding 75% for components. The project's hydropower output supports national energy security by reducing reliance on fossil fuels, though actual annual yields can fluctuate due to hydrological conditions, as evidenced by historical data showing 22.4 TWh generated in 2004 from partial operations. Full realization would enhance this to meet growing demand, projected at 380.2 TWh for Turkey's total electricity by 2025.

Broader Economic Growth and Investments

The Southeastern Anatolia Project (GAP) has contributed to broader economic expansion in Turkey's southeast by linking irrigation, hydropower, and infrastructure improvements to industrial diversification and private sector involvement. Government initiatives under GAP have prioritized public-private partnerships to channel investments into manufacturing, agro-processing, and services, with the region's per capita income rising from approximately 60% of the national average in the 1990s to closer alignment by the 2020s through enhanced productivity and market access. In December 2024, Turkey's government unveiled a new GAP Action Plan for 2024-2028, committing over $14 billion (equivalent to about 450 billion TL at prevailing exchange rates) to targeted development, including incentives for industrial zones and logistics hubs to boost exports and employment. This plan projects the generation of 570,246 new jobs by 2028, focusing on sectors like food processing and textiles that leverage GAP's agricultural outputs. Foreign and domestic investments have been attracted through build-operate-transfer (BOT) models for energy and transport projects, with growing interest in the region's hydropower potential and value-added industries; for instance, agencies established under GAP have facilitated connections between investors and local opportunities, leading to expanded agro-industrial facilities in provinces like Gaziantep and Şanlıurfa. Official targets emphasize equitable income distribution and reduced regional disparities, though actual returns depend on sustained water management and security conditions.

Social Impacts

Demographic Shifts and Poverty Reduction

The Southeastern Anatolia Project has facilitated notable demographic transformations in the region, primarily through accelerated urbanization and shifts in migration patterns. The proportion of the rural population declined from 44% to 36% over the course of the project's implementation, as economic opportunities in irrigated agriculture, hydropower operations, and associated infrastructure drew residents from rural areas to urban centers within the nine provinces covered by GAP. This internal rural-to-urban migration has been driven by expanded employment in construction and modern farming systems, reducing reliance on subsistence agriculture and fostering settlement in provincial capitals like Diyarbakır and Şanlıurfa. Population growth rates in the GAP region have consistently exceeded national averages, reflecting improved living conditions and resource mobilization under the project's human-centered development framework. Pre-project indicators showed higher fertility and infant mortality alongside lower life expectancy compared to the rest of Turkey, but subsequent infrastructure and economic integration have supported sustained demographic expansion, with the regional population reaching approximately 8.8 million by 2023 across its 9 provinces. These shifts have strained urban services but also promoted social integration through enhanced transportation and communication networks, countering historical isolation. In terms of poverty alleviation, GAP's integrated approach has targeted income disparities via irrigation-enabled agricultural productivity gains and job creation, elevating regional gross regional product (GRP) per capita from 47% of the national average at inception toward projected annual growth of 7.7%. Social programs under the project, including those addressing gender-balanced development and access to services, have contributed to narrowing poverty gaps, with official assessments noting reduced disadvantaged positions through diversified employment in hydropower (generating thousands of direct jobs) and value-added farming. Despite persistent regional lags—exacerbated by security challenges—these interventions have aligned with Turkey's broader poverty decline, fostering measurable improvements in household incomes tied to irrigated land expansion and energy outputs as of 2025.

Improvements in Education, Health, and Employment

The Southeastern Anatolia Project has prioritized social infrastructure development to address historical deficits in the region, including targeted investments in schools, health centers, and vocational training programs as outlined in its 1989 master plan. These efforts aim to align regional indicators with national averages through revenues generated from hydropower and irrigation expansions, though comprehensive causal attribution remains challenging due to concurrent national policies and demographic factors. Empirical data indicate modest gains, with the region still exhibiting disparities compared to western Turkey as of the early 2020s. In education, GAP-funded initiatives have expanded access to primary and secondary schooling, contributing to literacy rate increases from 55% in 1985 to 67% by 1997, driven by new facilities and teacher deployments in rural areas. By 2010, regional school enrollment rates approached 90% for primary levels, supported by project-linked infrastructure, though female literacy lagged at around 60% in some provinces due to cultural barriers not fully mitigated by GAP interventions. These advancements correlate with agricultural income growth enabling family investments in education, yet the region's overall literacy hovered below the national 95% mark in 2020, reflecting incomplete project realization and persistent socioeconomic challenges. Health improvements under GAP include the construction of over 100 health facilities by the mid-2000s, aimed at reducing infant mortality and enhancing maternal care through integrated rural outreach. Regional infant mortality declined from approximately 80 per 1,000 live births in the 1980s to around 25 per 1,000 by 2010, paralleling national trends but accelerated in irrigated districts via better water access and nutrition from expanded farming. Life expectancy in GAP provinces rose from about 65 years in 1990 to 75 years by 2020, with project contributions via electrification and , though rates remain 3-5 years below the Turkish average due to uneven service distribution and external factors like conflict. Official targets for parity with by project completion have not been fully met, as evidenced by higher regional under-five mortality persisting into the 2010s. Employment gains stem primarily from GAP's core irrigation and hydropower components, which have created direct construction jobs and indirect opportunities in agribusiness and manufacturing. Estimates project up to 3.8 million total jobs upon full implementation, encompassing farming, processing, and services tied to increased regional GDP. As of 2024, recent allocations of $14 billion under GAP frameworks generated over 570,000 positions, including 10,242 in Diyarbakır and 9,922 in Şanlıurfa from completed investments, boosting local unemployment reduction from 20% in the early 2000s to around 12% in core provinces by 2023. These figures reflect causal links to project-induced economic multipliers, such as doubled agricultural output fostering labor demand, yet youth unemployment exceeds 20% regionally, highlighting limitations from incomplete irrigation networks and skill mismatches.

Cultural Integration and Media Outreach

The Southeastern Anatolia Project incorporates cultural integration through targeted social development initiatives that emphasize preservation and promotion of regional heritage, aiming to enhance local identity while aligning with national development goals. The Cultural Heritage component seeks to build regional and national capacity for integrated management of cultural assets, including documentation of immovable properties in districts such as Birecik, Halfeti, and Suruç, as well as site landscaping projects like Acırlı in Midyat-Mardin. These efforts include grant schemes to restore local cultural assets and formulate regional heritage plans, which government sources present as fostering community pride and economic ties through tourism. However, implementation has faced challenges, including the submergence of historical sites due to dam construction, raising questions about net cultural benefits versus losses. Social programs under GAP, such as the Social, Cultural and Economic Development Support Program and Multi-Purpose Community Centers, facilitate integration by providing platforms for local participation in cultural activities, education, and economic cooperatives, with objectives to document and leverage the region's social-cultural structure for inclusive growth. These initiatives, coordinated by the GAP Regional Development Administration, include cross-cultural training materials developed to equip Turkish development personnel with skills for working in diverse southeastern communities, promoting mutual understanding amid ethnic complexities. Official narratives frame these as tools for reducing regional disparities and enhancing national cohesion, though independent analyses note their role in governmental strategies to counter separatism via economic dependency. Media outreach for GAP involves systematic dissemination of project achievements through official channels to build public support and international awareness. The GAP Administration maintains dedicated media resources, including photography and video galleries that highlight trails, craft traditions, and development successes like the "Sprouting of the Fertile Crescent" series. These assets, accessible via the project's website, serve to counter negative perceptions by showcasing tangible socio- progress, with content produced since the 1980s to align regional narratives with Turkey's modernization agenda. International cooperation programs further extend outreach by sharing GAP's people-oriented model globally, though domestic media efforts have been critiqued for underemphasizing displacement impacts in favor of promotional framing.

Environmental and Resource Management

Ecosystem Modifications and Mitigation Measures

The construction of 22 dams under the (GAP) has significantly modified regional ecosystems by inundating approximately 81,700 hectares for the alone, creating artificial reservoirs that transform riverine habitats into lacustrine environments and displace terrestrial flora and fauna. These reservoirs, totaling over 228,000 hectares across the GAP region, have fostered new aquatic ecosystems, with fish stocks in the Atatürk Reservoir reaching about 850 tons annually through species introductions such as carp and bass, though initial biodiversity was low due to the nascent ecosystem and limited nutrient inputs. Irrigation expansion, targeting 1.8 million hectares of arid and semi-arid lands, has converted dry steppes and rangelands into agricultural fields, leading to vegetation shifts, potential groundwater salinization from return flows, and risks of soil erosion or alkalization if drainage is inadequate. Biodiversity impacts include habitat fragmentation and loss of riparian species in flooded valleys, alongside opportunities for migratory bird usage of reservoirs, though downstream flow reductions within the project area exacerbate seasonal wetland desiccation. Limnological studies from 1992–1993 documented initial ecosystem dynamics in the Atatürk Reservoir, highlighting lower fish densities compared to upstream dams like Keban due to and variability. Potential health-related ecological risks, such as vector-borne diseases from stagnant waters, have been noted but not manifested as epidemics to date. Mitigation measures outlined in the GAP Master Plan emphasize environmental impact assessments (EIAs) for all sub-projects to preempt adverse effects, including soil conservation, erosion control via structural interventions, and reforestation to counteract deforestation from reservoir peripheries and irrigation infrastructure. The GAP Biodiversity Research Project, initiated in 2004 with UNDP collaboration, inventories regional species diversity and informs protection strategies, while the Wildlife Project establishes protected areas, such as in Bozova for the endangered soft-shelled turtle, and monitors migratory species along the Euphrates. Sustainable irrigation practices, including drip systems and precise water allocation based on soil and crop needs, aim to minimize salinization, with ongoing monitoring of , , and to address industrial discharges near sites like Şanlıurfa. Fishery enhancements, including annual fingerling releases totaling 2 million by the mid-1990s, support reservoir-based economies while stabilizing aquatic food webs.

Water Allocation and Downstream Geopolitics

The (GAP) plans to divert substantial volumes from the Euphrates and Tigris basins for irrigation across 1.7 million hectares, representing over two-thirds of the region's irrigable land, while prioritizing hydropower storage in reservoirs like the on the Euphrates. Turkey controls approximately 45% of the combined rivers' water resources through upstream infrastructure, enabling seasonal regulation but resulting in variable downstream releases influenced by filling phases, droughts, and domestic demands. Annual Euphrates flow originates predominantly from Turkey (89% of 35 billion cubic meters), with Syria contributing the remainder, allowing Ankara to assert sovereignty over utilization without prior comprehensive allocation treaties binding specific shares. Bilateral protocols have partially addressed flows: in 1984, Turkey committed to minimum releases to Iraq, followed by the 1987 Protocol on Economic Cooperation with Syria stipulating an average 500 cubic meters per second from the Euphrates at the border, equivalent to about 16 billion cubic meters annually, as an interim measure during Atatürk Dam filling. These arrangements lack enforcement mechanisms or trilateral ratification, and Turkey maintains they accommodate fair use given historical underdevelopment in its territory, rejecting downstream claims under the 1920 Treaty of Sèvres or 1946 additions as outdated and ignoring equitable principles like population needs (Turkey's basin population exceeds Syria and Iraq's combined). No binding allocation formula exists, with Syria and Iraq advocating proportional shares based on basin area or historical use, while Turkey emphasizes acquired rights through investment. Geopolitical frictions have intensified, with Syria and Iraq accusing Turkey of reducing flows—down 40% to Syria by 2024 due to GAP diversions and dams like Ilısu on the Tigris—exacerbating downstream salinization, crop failures, and scarcity amid climate variability. Turkey counters that releases meet protocol minima except during exceptional fillings (e.g., 1980s-1990s Atatürk impoundment) and links Syrian complaints to its past harboring of PKK militants, briefly withholding water in 1989-1990 as leverage before resuming. Iraq has appealed to the UN and Arab League, warning of humanitarian crises, while trilateral talks proposed since 2000s (e.g., 2009 joint committee) stalled over trust deficits; recent Ilısu operations further strained ties, prompting Iraqi lawsuits and Syrian diplomatic protests, though no military escalation has occurred. Turkish sources frame GAP as developmental equity, not aggression, amid basin-wide inefficiencies like Syria's own dams reducing Iraqi shares.

Controversies and Challenges

Resettlement and Human Displacement

The Southeastern Anatolia Project (GAP) has necessitated the resettlement of approximately 350,000 people across its 22 dams and associated infrastructure, primarily due to the flooding of agricultural lands and villages by reservoirs. This displacement, concentrated in Şanlıurfa, Şırnak, and Batman provinces, involved the submergence of over 200 villages and towns by 2010, with land expropriation processes often leading to involuntary relocations. The Atatürk Dam, the project's flagship structure completed in 1992, alone displaced around 18,121 families—equivalent to roughly 90,000 individuals—and inundated 52 villages, marking one of the largest single-site displacements in Turkish history. Turkish authorities managed resettlement through state-led programs under the State Hydraulic Works (DSI), constructing over 100 planned villages with modern housing, schools, health centers, and irrigation infrastructure to replace flooded settlements. Compensation included cash payments for lost land and assets, calculated at market rates, alongside options for in-kind replacements such as new farmland allocations; by 1997, over 100,000 people from major GAP dams had been resettled under these frameworks. In a notable departure for the Atatürk Dam, about 10% of displacees were relocated to western Turkey provinces like Manisa and İzmir, where surveys indicated higher adaptation rates, with resettlers reporting improved access to markets, education, and employment compared to those remaining in the southeast. Post-relocation infrastructure investments, funded partly by GAP revenues, aimed to mitigate livelihood losses by integrating resettled communities into expanded irrigation networks, though initial implementation faced delays due to security issues in the region during the 1990s. Despite these measures, displaced households frequently encountered short-term economic disruptions, including reduced agricultural productivity from unfamiliar soils and fragmented social networks, which eroded traditional kinship-based support systems and mechanisms. Cultural impacts were pronounced, as relocations severed ties to ancestral lands and historical sites, exacerbating feelings of marginalization among Kurdish-majority populations in the affected areas. Independent assessments, such as those from environmental migration studies, highlight that while official data emphasize infrastructure gains, unaccounted indirect displacements—from downstream or project-induced —may have affected tens of thousands more, though verifiable figures remain limited by inconsistent government reporting. Long-term evaluations, including from resettler surveys, suggest partial recovery, with many families achieving parity or better in income levels after 10-15 years, attributed to hydropower royalties reinvested in regional development.

Archaeological and Cultural Site Preservation

The Southeastern Anatolia Project's dams have submerged significant archaeological landscapes along the Euphrates and Tigris rivers, regions rich in prehistoric, Bronze Age, and medieval sites dating back over 12,000 years, necessitating extensive salvage operations to mitigate cultural losses prior to reservoir filling. Efforts began with earlier dams like Keban (impounded 1975), which prompted international salvage excavations uncovering Hittite and Assyrian artifacts, setting a precedent for GAP's systematic surveys and digs funded partly by project revenues. By the 1980s, Turkey's Ministry of Culture coordinated multidisciplinary teams, excavating over 300 sites across the Euphrates valley before Atatürk Dam's completion in 1990, though surveys covered less than 50% of some reservoir areas due to logistical constraints. For the Ilısu Dam on the Tigris, operational since 2020, preservation focused on , a 12,000-year-old settlement with Zoroastrian, Islamic, and medieval monuments; excavations commenced in 1986, leading to the relocation of key structures including the 15th-century Zeynel Bey Tomb and the 14th-century Artuklu Hamam to a new cultural park 1.5 km upstream, completed by 2018. Approximately 80% of Hasankeyf's old town was flooded by 2020, displacing over 3,000 residents to a modern settlement with replicated architecture, while underwater archaeology post-impoundment has revealed additional submerged features. Similar initiatives at and Karkamış dams (both completed early 2000s) involved geophysical surveys and artifact recovery, yielding Roman mosaics and Neo-Hittite reliefs now in museums, though critics from environmental NGOs contend that rushed timelines prioritized infrastructure over comprehensive intangible heritage documentation, such as oral traditions tied to Kurdish sites. Post-flooding assessments, including diver surveys at Atatürk reservoir in 2025, have identified preserved but threatened features like Neolithic rock carvings, underscoring ongoing challenges from sedimentation and water level fluctuations that degrade unexcavated remains. Turkish authorities maintain that GAP's cultural programs, including a 1990s regional heritage plan, have enhanced site management through landscaping and tourism integration, with over 200 monuments conserved or relocated project-wide. However, independent analyses highlight uneven implementation, with some valleys experiencing irreversible losses of multi-layered tells due to incomplete pre-flood mapping, balanced against the argument that dam revenues enabled discoveries otherwise unattainable amid limited state budgets.

Political Criticisms and Ethnic Tensions

The Southeastern Anatolia Project has drawn political criticism for its centralized planning and implementation, with detractors arguing that it reflects Ankara's prioritization of national security objectives over genuine socioeconomic integration in Kurdish-majority provinces. Kurdish activists and analysts have contended that the project's master plan, formalized in 1989, functions less as a development initiative and more as a mechanism to consolidate Turkish state control in restive southeastern regions, where local governance input remains minimal despite promises of regional autonomy in resource management. This perspective posits that benefits such as irrigation expansion and hydropower—intended to boost per capita income from $1,300 in 1990 to projected levels above the national average—have disproportionately accrued to non-local contractors and elites, exacerbating perceptions of exclusion amid persistent underinvestment in Kurdish-specific needs like language rights and cultural preservation. Turkish officials counter that such criticisms overlook empirical gains in infrastructure, though independent assessments indicate no substantial decline in separatist violence attributable to the project. The Kurdistan Workers' Party (PKK), designated a terrorist organization by Turkey and multiple Western governments, has vocally opposed GAP since its escalation in the early , viewing the dams as symbols of Turkish domination over Kurdish lands and water resources. PKK militants have carried out sabotage operations targeting GAP facilities, including attacks on construction sites and irrigation channels throughout the and , which delayed timelines and inflated costs estimated at over $32 billion by 2010. These actions align with PKK rhetoric framing the project as an existential threat, though quantitative analyses, such as Delphi-method surveys among experts, reveal that GAP has not measurably curbed PKK recruitment or activities, with insurgency levels remaining tied more to broader political repression than economic outputs. Pro-Kurdish political parties, including predecessors to the current DEM Party, have echoed these concerns in parliamentary debates, criticizing the project's failure to foster inclusive governance and accusing it of entrenching ethnic hierarchies under the guise of modernization. Ethnic tensions surrounding GAP stem from its location in provinces with Kurdish populations exceeding 70% in some areas, where the project is accused of facilitating assimilation through forced resettlements and induced demographic shifts. Over 100,000 individuals, predominantly Kurds, were displaced by dam constructions like Atatürk (completed 1990) and Ilısu (operational 2020), with resettlement programs criticized for inadequate compensation and relocation to urban peripheries that dilute traditional rural Kurdish communities. Critics, including Kurdish intellectuals, argue this engineers a "water moat" not only against downstream states but internally to fragment Kurdish cohesion, with expert consensus in one study (73% agreement) attributing negative impacts on Kurdish identity preservation. Conversely, 82% of surveyed experts found no evidence that GAP promoted a shared Turkish-Kurdish national identity, highlighting how unaddressed grievances—such as water diversion perceived as weaponization against local agriculture—perpetuate alienation rather than reconciliation. While Turkish state narratives emphasize equitable development, the persistence of these tensions underscores causal links between top-down hydro-infrastructure and unresolved ethnic fault lines, as evidenced by unchanged patterns of Kurdish political mobilization post-project phases.

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