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Karnaphuli River
Aerial view of the Karnaphuli River estuary
Map
Location
CountriesIndia and Bangladesh
CitiesChittagong
Physical characteristics
Source 
 • locationSaithah, Mizoram, India
Mouth 
 • location
Bay of Bengal
Length270 km (170 mi)
Basin size13,964.8 km2 (5,391.8 sq mi)[1]
Discharge 
 • locationNear mouth
 • average1,510 m3/s (53,000 cu ft/s)[2]
Karnaphuli river from BNA road
Karnaphuli River From Shah Amanat Bridge

The Karnaphuli River (Bengali: কর্ণফুলি Kôrnophuli; also spelt Karnafuli[3] and Khawthlangtuipui[4] in Mizo, meaning "western river" and Borgang in Chakma, meaning "Big River") is the largest and most important river in Chittagong and the Chittagong Hill Tracts. It is a 667-metre (2,188 ft) wide river in the south-eastern part of Bangladesh. Originating from the Saithah village of Mamit district in Mizoram, India, it flows 270 kilometres (170 mi) southwest through Chattogram Hill Tracts and Chattogram into the Bay of Bengal. It is the fastest flowing river in Bangladesh, after the Padma.

The river is said to "represent the drainage system of the whole south-western part of Mizoram."[5] Principal tributaries include the Kawrpui River or Thega River, Tuichawng River and Phairuang River. A large hydroelectric power plant was built on the Karnaphuli in the Kaptai region in the 1960s. The mouth of the river hosts the Port of Chattogram, the largest and busiest seaport of Bangladesh.

Etymology

[edit]

The presence of Arab traders and merchants in the history of Chittagong led to many areas in Chittagong to have names of Arabic origin. The name of this river is thought to have come from qarnaful, the Arabic word for clove, and refers to an incident in which an Arab ship full of cloves sank in this river.[6]

Course

[edit]

Chittagong City

[edit]

Chittagong is situated on the banks of the Karnaphuli River between the Chittagong Hill Tracts and the Bay of Bengal. The city is a noteworthy seaside seaport city and monetary focus in southeastern Bangladesh. The Chittagong Metropolitan Area has a populace of more than 8.9 million,[7] making it the second biggest city in Bangladesh. It is the capital of an eponymous locale and division. A water treatment plant has been set up by Chittagong Port Authority to source water from the Karnaphuli river for its uses. The plant will make the port self-reliant in its water needs.[8]

Tlabung

[edit]

Tlabung is situated on the banks of the Karnaphuli River in Lunglei district, Mizoram. Karnaphuli River links Mizoram with the port city of Chittagong on the shores of Bay of Bengal. British Troops and missionaries used this route to reach Mizoram during the Colonial days. It used to take 5 days to reach from Chittagong to Tlabung on a motorboat, a distance of about 90 kilometers, after which they would travel another 35 kilometers to reach Lunglei.[9]

Transport

[edit]
Shah Amanat Bridge

The government had awarded a contract to build a two lane Karnaphuli tunnel underneath the Karnaphuli river to China Communication Construction Company (CCCC). This is the first underwater tunnel in Bangladesh. CCCC received $706 million for its services, with total costs expected to be over $1 billion.[10]

Kaptai dam

[edit]
Kaptai Lake on Karnaphuli River

The Kaptai Dam is the location of the Karnafuli Hydroelectric Power Station, constructed in Kaptai in 1962 and the only hydroelectric power plant in the country. An earth-filled dam on the Karnaphuli River, the Kaptai Dam, created the Kaptai Lake, which acts as the water reservoir for the hydropower station. The power plant produces a total of 230 megawatts of electricity. When then east Pakistan built the dam, Indian Prime Minister Jawaharlal Nehru didn't object even though it resulted in part of Indian side getting submerged and inflow of more than 40000 refugees.[11]

Pollution

[edit]

Like many rivers in Bangladesh, Karnaphuli is heavily polluted by agricultural runoff. Reducing the amount of oxygen available and harming aquatic life in the river.[12] In 2015, a train carrying oil crashed over a tributary of the river. The spill caused environmental degradation.[13]

Aquatic life

[edit]

The river is home to the Ganges river dolphin, which is an endangered species.[14] Hilsa used to be common in the river, but have nearly disappeared from the river due to pollution.[12]

[edit]
  • View from the middle of the Karnafuli
  • View of the river
    View of the river
  • Ships at Karnaphuli River
    Ships at Karnaphuli River
  • Port of Chittagong and Karnaphuli River at night
    Port of Chittagong and Karnaphuli River at night
  • Tourist at Karnafuli River Cruise
    Tourist at Karnafuli River Cruise

See also

[edit]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Karnaphuli

View on Grokipedia
from Grokipedia
The Karnaphuli River is a transboundary waterway originating in the Lushai Hills of Mizoram, India, and extending approximately 270 kilometers (170 miles) southward through the Chittagong Hill Tracts of southeastern Bangladesh before discharging into the Bay of Bengal near the port city of Chittagong.[1][2] Its catchment area spans about 11,000 square kilometers, making it a key hydrological feature independent of Bangladesh's major Ganges-Brahmaputra-Meghna river systems.[2] The river's course supports critical infrastructure, including the Kaptai Dam, constructed in 1962 as Bangladesh's sole hydroelectric facility with a capacity of 230 megawatts, impounding waters to form Kaptai Lake for power generation that supplies roughly 5% of the nation's electricity.[3][4] However, the dam's development displaced tens of thousands of residents, predominantly indigenous communities, submerging agricultural lands and prompting long-term social and ecological disruptions without adequate compensation or resettlement.[4] Downstream, the Karnaphuli facilitates maritime navigation and anchors the Port of Chittagong, South Asia's busiest container terminal, enabling trade vital to Bangladesh's economy.[5] Industrial activities along its banks, including shipbreaking yards and manufacturing effluents, have severely contaminated the river with heavy metals, microplastics, and urban waste, elevating risks to aquatic ecosystems and human health in the surrounding four-million-resident area.[6][7][8] Despite mitigation efforts, sedimentation and pollution persist, underscoring tensions between economic utility and environmental sustainability in this densely industrialized corridor.[6]

Geography

Etymology

The name Karnaphuli (Bengali: কর্ণফুলী, romanized as Kôrnophuli) derives from the compound Bengali term karṇaphula, literally meaning "ear flower," where karṇa signifies "ear" and phula denotes "flower," evoking an earring or floral ornament worn on the ear.[9] This etymology is tied to a local folk legend recounting a tragedy between an Arakanese princess and a Chittagong tribal prince during a moonlit boat excursion, in which a flower gifted by the prince and adorning her ear fell into the river; distressed, she leaped in to recover it but was carried away by the current and drowned, prompting the prince to take his own life in despair to join her.[9] The incident purportedly inspired the river's designation as Karnafuli, symbolizing the lost "ear flower."[9] Among indigenous communities, the river holds alternative designations reflecting tribal linguistic traditions, such as Kynsa Khyong in the Marma language.[9] In the Mizo language of Mizoram, from where the river originates, it is known as Khawthlangtuipui, interpreted as "western river," highlighting its geographical orientation relative to the region's topography.[9] These variants underscore the river's cultural significance across ethnic groups in the Chittagong Hill Tracts and adjacent Indian territories, though the Bengali name predominates in broader documentation and usage.[9]

Course and Hydrology

The Karnaphuli River originates in the Lushai Hills of Mizoram state, northeastern India, and flows approximately 270 kilometers southwest, entering Bangladesh and traversing the Chittagong Hill Tracts before passing through the city of Chittagong.[10] [11] In its upper reaches, the river is impounded by the Kaptai Dam near Kaptai in Rangamati district, forming Kaptai Lake, which regulates flow and provides hydropower but reduces downstream sediment transport and peak discharges.[12] Below the dam, the river continues southeast for about 65 kilometers to its estuary at Chittagong, where tidal influences extend upstream, and it discharges into the Bay of Bengal.[13] The river's catchment area covers roughly 11,000 square kilometers, encompassing hilly terrain in India and Bangladesh that experiences heavy monsoon precipitation, leading to highly variable seasonal flows.[12] [14] Average discharge is approximately 1,901 cubic meters per second, with peaks exceeding 10,000 cubic meters per second during the monsoon (June–September) and lows below 200 cubic meters per second in the dry season, exacerbated by upstream dam regulation and reduced baseflow.[15] [12] The hydrology is further influenced by steep gradients in the headwaters (dropping over 600 meters), promoting rapid runoff, while the lower estuarine section features brackish conditions and sediment deposition due to tidal backwater effects.[10]

Tributaries and Basin

The Karnaphuli River basin covers approximately 11,000 km², with the majority located in southeastern Bangladesh's Chittagong district and Chittagong Hill Tracts, extending upstream into India's Mizoram state in the Lushai Hills.[8] [14] The basin's topography includes steep, hilly upstream areas conducive to high runoff during monsoons, grading into broader alluvial plains and estuarine zones near the Bay of Bengal, influencing sediment transport and flood dynamics. Principal right-bank tributaries are the Kasalong, Chengi, Halda, and Dhurung rivers, while left-bank contributors include the Subalong, Kaptai, Rinkeong, and Thega (or Phairuang).[16] [17] The Chengi and Kasalong drain significant upstream hill tracts, delivering substantial sediment loads to the main stem, whereas the Halda, joining downstream, supports unique ecological functions such as carp spawning grounds due to its shallow, silt-free characteristics during breeding seasons.[18] The Kaptai tributary feeds into the river's regulated upper reach via the Kaptai Reservoir, altering natural flow regimes in the basin's headwaters.[19] Basin-wide drainage exhibits moderate elongation and bifurcation ratios, indicative of dendritic patterns shaped by tectonic and climatic factors, with annual rainfall exceeding 2,500 mm in upper catchments driving peak discharges that exacerbate downstream flooding in urban Chittagong.[20] Sub-basin delineations vary from 22 km² to over 2,600 km², reflecting heterogeneous geomorphic controls on runoff concentration and flash flood susceptibility.

Infrastructure

Transportation

The Karnaphuli River serves as a vital artery for transportation in southeastern Bangladesh, particularly facilitating road, rail, and maritime connectivity around Chittagong. Multiple bridges span the river to link the city with surrounding areas, with the Kalurghat Bridge, originally constructed in 1914 to support military logistics during World War I, functioning primarily as a railway crossing near the river's upper reaches. The Karnaphuli Bridge, a 919.48-meter-long steel truss structure on steel pile foundations located at Chandgaon, was built to enhance road access across the river.[21] The Shah Amanat Bridge, also known as the Third Karnaphuli Bridge, represents a more recent addition, completed in 2010 after construction began in August 2006; this 950-meter-long prestressed concrete extradosed bridge features three main 200-meter spans and cost approximately US$45 million, improving connectivity between Chittagong and Cox's Bazar regions.[22] Plans for a new rail-cum-road bridge over the Karnaphuli, estimated at Tk11,560.77 crore, were initiated by Bangladesh's interim government in 2024, with completion targeted by 2030 to further bolster freight and passenger transport.[23] Additionally, the Karnaphuli Tunnel project, underway since 2024, aims to provide an under-river crossing to reduce reliance on bridges and alleviate traffic congestion in the Chittagong-Cox's Bazar corridor.[24] Navigation along the Karnaphuli is central to regional trade, as the river provides access to the Port of Chittagong, Bangladesh's primary seaport situated about 9 nautical miles upstream from the Bay of Bengal.[25] The 120-nautical-mile waterway accommodates vessels ranging from small fishing boats to large cargo ships and oil tankers, with pilotage services guiding traffic through designated anchorages and the river estuary.[26] Ferry services supplement fixed crossings, including a route introduced in July 2023 at Kalurghat to transport passengers and vehicles across the river amid high demand and occasional overcrowding on boats.[27] These ferries, alongside local sampans and cruise boats, handle daily commuter and tourist traffic, though safety concerns persist due to vessel density and river conditions.[28] ![Ships at Karnaphuli River](./assets/Ships_at_Karnaphuli_River_11

Kaptai Dam

The Kaptai Dam is an earth-fill embankment structure situated on the Karnaphuli River in Rangamati District, southeastern Bangladesh, designed primarily for hydroelectric power generation, with secondary roles in flood control and irrigation.[29] Construction commenced in 1957 under the Government of Pakistan, with financial and technical assistance from the United States Agency for International Development (USAID), and the project was commissioned on March 30, 1962.[30] [31] The dam spans approximately 670 meters in length and stands 43 meters high, creating the expansive Kaptai Lake reservoir.[32] The integrated Karnaphuli Hydroelectric Power Station features five Kaplan turbine-generator units, with two units of 40 MW each added initially in 1962 and three additional 50 MW units installed between 1982 and 1988, yielding a total installed capacity of 230 MW.[3] [33] Operated by the Bangladesh Power Development Board (BPDB), the facility has historically supplied around 5% of the country's electricity, harnessing the river's seasonal flow variations for peak-load generation.[3] As Bangladesh's sole major hydroelectric installation, it underscores the nation's limited exploitation of hydropower potential despite the Karnaphuli's hydrological advantages.[34] Engineering challenges have included siltation reducing effective reservoir storage over decades, impacting output reliability amid changing precipitation patterns.[35] Maintenance efforts focus on turbine efficiency and spillway operations to manage monsoon floods, ensuring infrastructural resilience in a sediment-laden tropical river system.[36]

Economic Contributions

Hydropower Generation

The Kaptai Hydroelectric Power Station, located immediately downstream of the Kaptai Dam on the Karnaphuli River in Rangamati District, Bangladesh, represents the country's primary and only major source of hydroelectric power. Commissioned on March 30, 1962, the facility initially featured two generating units with a combined capacity of 80 MW, later expanded to five units totaling 230 MW installed capacity.[37][30] Electricity generation relies on the regulated flow from Kaptai Lake, the reservoir impounded by the dam, which provides the necessary hydraulic head for the turbines. Output varies with seasonal water availability, influenced by monsoonal inflows into the Karnaphuli River basin; peak production occurs during high-water periods, such as July 2025 when all five units delivered 218 MW amid elevated reservoir levels.[38][39] The plant supplies approximately 5% of Bangladesh's total electricity consumption, playing a critical role in diversifying the energy mix dominated by fossil fuels, though its contribution remains limited by hydrological constraints and the absence of additional large-scale hydro resources.[30] Efforts to enhance output, including potential unit refurbishments or supplementary installations, have been proposed to address growing national demand, but implementation faces technical and environmental hurdles.[36]

Navigation and Port Facilities

The Karnaphuli River provides the primary navigational channel for the Port of Chattogram, situated about 11 kilometers upstream from its estuary at the Bay of Bengal, enabling access for oceangoing vessels despite periodic siltation challenges.[40] The river's navigability supports the handling of bulk cargo, containers, and general freight, with vessels typically anchoring in designated areas outside prohibited zones near the entrance to avoid hazards.[41] Ongoing dredging initiatives, such as those completed in phases up to 2022, have deepened the channel to accommodate ships with drafts up to 9.5 meters, allowing capacities of 1,500 to 2,000 containers per vessel and reducing shipping costs by approximately 40 percent through decreased reliance on lighterage.[42] [43] The Port of Chattogram, Bangladesh's principal seaport, features 19 general cargo berths, specialized container terminals, and supporting infrastructure including gantry cranes, straddle carriers, mobile cranes, and forklifts for efficient cargo handling.[44] It processes over 90 percent of the nation's export-import trade, with hinterland connectivity via road, rail, and inland waterways facilitating distribution.[45] Recent enhancements include additional jetties on the Karnaphuli, such as those operational since 2021, which have increased berth availability for bulk carriers, allowing up to seven jetties to service six vessels simultaneously.[46] Capital dredging and bank protection projects continue to address sedimentation, aiming to sustain navigability from key bridges to inner jetties like Sadarghat.[47] Navigation protocols emphasize caution due to the river's tidal influences and congestion risks, particularly during peak periods, with masters required to maintain clear of restricted anchorages and coordinate with port authorities for safe passage.[48] The port's strategic location supports transshipment for landlocked neighbors, though shallow depths limit direct calls by ultra-large container ships, necessitating feeder services from deeper-water hubs.[49]

Environmental Aspects

Pollution Sources

The primary sources of pollution in the Karnaphuli River stem from industrial effluents discharged along its banks in Chittagong, including untreated wastewater from shipbreaking yards, oil refineries, fertilizer plants, and textile factories, with over 1,000 such facilities contributing heavy metals like chromium, cadmium, zinc, lead, and nickel.[50][51][52] Shipbreaking activities, concentrated on the river's shoreline with hundreds of yards operational, release oil, grease, and metal contaminants directly into the waterway, exacerbating total petroleum hydrocarbon (TPH) levels comparable to heavily polluted global sites.[6][53] Domestic sewage and solid waste from Chittagong's urban population, estimated at over 5 million residents, constitute another major contributor, with untreated household effluents and garbage dumped directly into the river, leading to organic overload and nutrient enrichment.[54][55] Navigational pollution arises from port operations and vessel traffic at Chittagong Port, including oil spills, bilge discharges, and antifouling paint residues, which introduce persistent hydrocarbons and microplastics into the estuary.[56][57] Microplastic pollution, rated as a significant ecological load (Category I hazard), originates from industrial packaging waste, urban runoff, and degraded fishing gear, with higher concentrations observed near industrial zones and propagating seaward.[14][58] Atmospheric deposition and minor agricultural runoff play lesser roles, but industrial and urban sources dominate, as evidenced by sediment core analyses showing heavy metal accumulation accelerating over the past 30 years.[59][60]

Aquatic Life and Biodiversity

The Karnaphuli River estuary serves as a critical habitat and breeding ground for diverse fish populations due to its favorable water currents and geographic position.[7] A 2020 ichthyodiversity assessment identified 128 species of finfish and shellfish in the Karnaphuli system, comprising 110 finfish and 18 shellfish species, highlighting its role within interconnected river networks in southeastern Bangladesh.[61] Common species include Puntius sophore, which dominates catches at approximately 8.36% abundance, alongside planktivores and other freshwater and estuarine forms like Bagarius bagarius.[62] Biodiversity has undergone substantial decline, attributed to factors such as river morphology alterations, water quality degradation, and upstream damming. Historical records indicate over 150 fish species in the Karnaphuli, but contemporary availability is limited to 8-10 species, reflecting habitat fragmentation and pollution pressures.[10] Zooplankton communities in the estuary exhibit moderate diversity, with studies from 2010-2012 documenting varied assemblages influenced by seasonal hydrology, supporting the base of the aquatic food web.[63] Phytoplankton and other primary producers contribute to the ecosystem, though specific counts for the Karnaphuli align with broader Bangladeshi estuarine patterns of around 87 phytoplankton species.[64] Aquatic fauna face ongoing risks from contaminants, including heavy metals bioaccumulating in edible fish species, as detected in analyses of eight common varieties from the river.[65] Mass die-offs, such as those in March 2024 involving multiple fish and aquatic species due to industrial effluent from a sugar factory fire, underscore acute threats to remaining biodiversity.[66] These pressures have reduced the river's capacity to sustain viable populations, with estuarine microbial and faunal distributions further altered by sedimentation and physio-chemical shifts.[67][68]

Historical and Social Impacts

Construction Era and Development Rationale

The Kaptai Dam, central to the Karnaphuli Hydroelectric Project, was constructed during the East Pakistan period under the government of Pakistan to bolster regional energy infrastructure. Site investigations dated back to earlier reconnaissance in 1906 and 1923, but formal site selection occurred in 1951 under the guidance of chief engineer Khwaja Azimuddin. The International Engineering Company was contracted in 1952 for planning and design, with construction commencing in 1957 by Utah International Inc. as the general contractor. The earthfill dam, measuring 666 meters in length and 43 meters in height, reached completion in 1962, enabling the initial two 40 MW turbine units to begin commercial operation on February 26, 1962.[3][69] The project's core rationale centered on generating hydroelectric power to meet the escalating electricity needs of East Pakistan, particularly in the Chittagong area, where industrial expansion and port operations strained limited thermal generation capacity. Installed with an eventual 230 MW output—constituting about 5% of Bangladesh's electricity supply today—the dam was envisioned as a catalyst for economic modernization by providing reliable, low-cost energy from the Karnaphuli River's steep gradients and high flow. Financed initially by the East Pakistan government and later supported by U.S. aid through agencies like USAID, the initiative aligned with Cold War-era development priorities aimed at fostering self-sufficiency in power amid regional geopolitical tensions.[3][69] As a multipurpose scheme, the dam sought additional benefits including flood mitigation during monsoons, irrigation for agricultural lands, enhanced navigation for timber and goods transport along the reservoir, and drainage improvements. These objectives were outlined in project proposals to maximize the Karnaphuli basin's potential, though hydropower remained the dominant driver, with the reservoir—later forming Kaptai Lake—intended to regulate water for sustained output. Despite these aims, implementation prioritized rapid infrastructure buildup over comprehensive socioeconomic assessments.[30][3]

Indigenous Displacement

The Kaptai Dam, completed in 1962 on the Karnaphuli River, created a reservoir that submerged approximately 40% of the agricultural land in the Chittagong Hill Tracts (CHT), displacing around 100,000 indigenous people from their ancestral territories.[70] Primarily affecting the Chakma tribe, who comprised about 70% of the displaced population, the inundation submerged homes of roughly 18,000 families and 22,000 hectares of cultivable land, disrupting traditional jhum (shifting) cultivation practices central to their livelihoods.[71][30] Rehabilitation efforts were uneven and inadequate for indigenous groups; while approximately 18,000 Bengali families received relocation support, many tribal families were resettled on marginal, infertile lands unsuitable for agriculture, exacerbating food insecurity and cultural disruption.[72] This displacement, representing nearly 25% of the CHT's population at the time, led to significant out-migration, with tens of thousands of Chakma fleeing to India, including around 40,000 to Arunachal Pradesh and 45,000 to Tripura, often facing further hardships as refugees.[73][74][4] The lack of consultation with indigenous communities prior to construction, driven by national development priorities for hydropower and irrigation under Pakistan-era planning, sowed seeds of long-term grievances, contributing to ethnic insurgencies and demands for autonomy in the CHT.[75] Independent analyses from indigenous advocacy groups highlight that the project's benefits accrued disproportionately to urban and Bengali populations, while costs were borne by hill tribes, underscoring failures in equitable development.[76][77]

Controversies and Viewpoints

The construction of the Kaptai Dam on the Karnaphuli River, completed in 1963, has been a focal point of debate regarding the prioritization of national development over indigenous rights. Proponents, including Pakistani and later Bangladeshi authorities, argued that the project was essential for hydropower generation—producing 230 megawatts initially—and flood control, enabling irrigation for 54,000 hectares and facilitating navigation improvements that supported Chittagong's port economy.[30] However, critics contend that these benefits were overstated relative to the social costs, with the reservoir submerging approximately 40% of the Chittagong Hill Tracts' (CHT) cultivable land and displacing around 100,000 people, predominantly indigenous Jumma groups such as the Chakma, without adequate consultation or culturally sensitive resettlement.[4][78] Indigenous viewpoints highlight the dam as a catalyst for long-term human insecurity, including loss of traditional jhum (shifting) cultivation, food scarcity, and forced migrations, with many displaced persons relocating multiple times—averaging 1.7 times per household—and thousands seeking refuge in India as unrecognized stateless persons.[79][80] The Parbatya Chattagram Jana Samhati Samiti (PCJSS), formed in 1972 partly in response to Kaptai's legacies, has framed the project as emblematic of systemic marginalization, arguing it exacerbated ethnic tensions and contributed to armed insurgency in the CHT through 1997.[32] Government responses, such as partial cash compensations estimated at only 25% of affected populations receiving aid, have been criticized for favoring Bengali settlers and failing to restore livelihoods, with studies indicating persistent poverty and cultural erosion among survivors.[30][78] Contemporary analyses reveal geopolitical dimensions, including U.S. aid during the Cold War era that portrayed CHT indigenous communities as "primitive" to justify intervention, sidelining local agency in decision-making.[75] While official narratives emphasize the dam's role in Bangladesh's energy independence post-independence in 1971, human rights advocates counter that unresolved grievances from Kaptai underscore broader failures in development-induced displacement policies, with calls for reparations and land rights restoration persisting into the 2020s.[4][31] This divide reflects tensions between state-centric economic imperatives and indigenous claims to self-determination, with empirical data on displacement outcomes supporting critiques of insufficient mitigation measures.

References

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  22. Shah Amanat Bridge - Rendel
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  80. Involuntary Displacement and Human Security: A Study of the Kaptai ...
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