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Aerial view of Flevopolder

Key Information

The Flevopolder is an island polder forming the bulk of Flevoland, a province of the Netherlands. Created by land reclamation, its northeastern part was drained in 1955 and the remainder—the southwest—in 1968.

Unlike other major polders, it is surrounded by lakes and below-sea-level channels. By some definitions, it is the world's largest artificial island. Levees, dikes, and pumping were used to drain the land. The polder's name references the ancient Lake Flevo. The Flevopolder, along with the Noordoostpolder, forms the Flevoland province, which is located near Amsterdam in the southwest and Kampen, Overijssel in the northeast.

Boundaries

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Unlike other major polders, such as Noordoostpolder and Wieringermeer, the Flevopolder is surrounded by bordering lakes or below-sea-level channels. These are the IJsselmeer, the Veluwemeer, Ketelmeer, and Gooimeer. By some definitions, it is the largest artificial island in the world.[2][3][a]

History

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Reclamation of its land

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Levees and dikes were first built around the polder. However, unlike similar projects, the internal water was then drained by diesel and electric pumps.

Etymology

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Its name refers to the ancient Lake Flevo.

Geography

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Main article: Flevoland

The Flevopolder together with the Noordoostpolder forms the province of Flevoland, the most recent province to be added to the Netherlands. Its southwestern point is close to Amsterdam and its opposite end is close to Kampen, Overijssel. It has three highly dominant settlements in terms of distribution of population.

Footnotes

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References

[edit]
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Flevopolder

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from Grokipedia
The Flevopolder is an expansive in central , comprising the Eastern and Southern Flevoland regions and forming the primary landmass of province, which was established in 1986 as the country's youngest province. Created through the ambitious —a massive engineering project to reclaim land from the former inlet—this stands as the world's largest, spanning 970 square kilometers (374.5 square miles) of fertile, low-lying terrain mostly below sea level. Reclamation efforts began after the completion of the dam in 1932, which transformed the saline into the freshwater ; the Eastern Flevopolder was drained and made arable by 1957, while the Southern Flevopolder followed in 1968, enabling the development of agricultural fields, urban centers like and , and protected natural areas. This engineering feat not only mitigated flood risks but also expanded habitable land to alleviate population pressures in the densely populated region, supporting modern farming, housing for over 400,000 residents, and initiatives within the ecosystem.

Overview

Definition and Location

The Flevopolder is an artificially created , a low-lying tract of land reclaimed and enclosed by dikes, formed by draining sections of the —a freshwater lake created from the former sea inlet—primarily between 1950 and 1968 as part of the Netherlands' extensive project. This reclamation process transformed marine seabed into , establishing the polder as a foundational element of modern Dutch geography and agriculture. The Flevopolder constitutes the majority of the land area within province, exemplifying innovative water management techniques that have defined the nation's landscape. Geographically situated in the central , the Flevopolder lies at coordinates approximately 52°27′N 5°30′E, encompassing an area of 970 km² (370 sq mi). This makes it the world's largest , surrounded by bodies of water including the to the north and west, the to the southwest, and smaller lakes such as the Veluwemeer and Gooimeer. Its island status stems from these encircling waters, which isolate it from the mainland while integrating it into the country's hydraulic infrastructure. The is bordered by the provinces of to the southwest, to the south, to the east, and to the northeast, with the forming natural boundaries in other directions. It forms a key component of the ' national water management system, which was significantly advanced by the completion of the in 1932—a 32 km primary dike that closed off the from the , enabling subsequent polder reclamations. In 1986, the reclaimed lands of the Flevopolder, along with the adjacent , were officially organized into the province of , marking it as the ' youngest and twelfth . This administrative establishment on January 1, 1986, solidified the region's integration into the national framework, supporting population growth and economic development on this engineered terrain.

Significance and Boundaries

The Flevopolder exemplifies Dutch engineering prowess in , serving as a cornerstone of the , a monumental project initiated in 1918 to protect against flooding and expand . This initiative transformed the former inlet into the lake, ultimately reclaiming approximately 1,620 square kilometers of land across multiple polders through dikes, drainage, and soil improvement, thereby safeguarding low-lying regions and boosting agricultural productivity. The Flevopolder itself, comprising the Eastern and Southern sections, stands out for its scale and innovation, demonstrating integrated water management that has influenced global practices. Globally, the Flevopolder is recognized as the largest artificial island, spanning 970 square kilometers, and has enabled rapid societal development by supporting a population growth from zero inhabitants upon reclamation to approximately 380,000 residents as of 2025. This expansion underscores its role in addressing land scarcity in a densely populated nation, with urban centers like Almere and Lelystad emerging as key hubs for housing and employment. Physically, the Flevopolder lacks natural borders and is entirely delimited by a network of dikes and canals enclosing it within surrounding freshwater bodies: the to the north and west, the to the southwest, the Gooimeer and Naardermeer to the south, the Veluwemeer and Wolderwijd to the northeast, and the Ketelmeer to the east. Administratively, it is subdivided into the municipalities of , , , and , forming the core of province, which was officially established on January 1, 1986, to unify governance over the reclaimed territories.

Historical Development

Planning and Etymology

The name Flevopolder derives from the ancient Roman designation Lacus Flevo, referring to a prehistoric freshwater lake that occupied the region during the 1st century AD, as described by the Roman historian in his Naturalis Historia. This lake, which predated the formation of the due to medieval flooding and sea-level rise, represented a significant body of inland water in the . The choice of name for the was intentional, aiming to invoke a sense of historical continuity between the reclaimed land and its ancient hydrological past. The conceptual origins of the Flevopolder trace back to the late but gained momentum in the 1920s as part of engineer Cornelis Lely's ambitious 1891 proposal to reclaim the , a shallow of the prone to devastating floods. Lely's vision, refined through expeditions assessing soil fertility for agriculture, was formalized by the Zuiderzee Act of 1918, which authorized the enclosure of the to create new and enhance flood protection. Planning intensified in the 1920s amid post-World War I economic pressures and the urgent need for food security, with initial studies confirming the site's suitability for large-scale reclamation. The project's feasibility was solidified after the completion of the in 1932, a 32-kilometer barrier that transformed the saline into the freshwater , enabling controlled drainage of subsequent polders. Key planning decisions emphasized a phased approach to manage the immense scale of the Flevopolder, approximately 97,000 hectares, by dividing it into the Northeast (Oostelijk Flevoland) and Southwest (Zuidelijk Flevoland) sections to allow sequential construction and minimize risks. This division drew lessons from earlier reclamations, incorporating bordering lakes to prevent groundwater intrusion into adjacent farmlands. The project was delayed by , which disrupted materials and labor, shifting focus to wartime needs until postwar recovery in the late 1940s. Primary objectives included expanding agricultural capacity on fertile clay soils, providing housing to alleviate overcrowding in the urban area, and reserving portions for natural preservation to support . Developments in the 1930s and 1940s built on the successes of prior polders, integrating Flevopolder planning with the (reclaimed ) and (dike closed 1939, drained 1942) to form a cohesive polder system. Initial hydrographic and soil surveys commenced in 1936 to map the 's bed and evaluate drainage feasibility, informing the overall framework. Dike construction for the Flevopolder began in 1950, marking the transition from to execution while adhering to Lely's original blueprint.

Reclamation Process

The reclamation of the Flevopolder proceeded in two distinct phases as part of the broader , converting former waters into land through systematic enclosure and drainage. The Eastern Flevopolder, encompassing 540 km², had its enclosing dike completed and closed on September 13, 1956, initiating the drainage process that rendered the area dry by June 29, 1957. Similarly, the Southern Flevopolder, spanning 430 km², saw its dike closed on October 25, 1967, with full drainage achieved by May 29, 1968. Engineering efforts centered on robust dike construction and extensive water removal to create stable, usable terrain. For the Eastern phase, a 27 km dike was built using compacted layers of clay for impermeability and sand for structural support, forming a secure barrier against the . Water expulsion relied on a network of diesel- and electric-powered pumping stations, which removed water over two years to lower the lake bed below . followed, incorporating additional clay layers to mitigate risks inherent to the peaty seabed, ensuring long-term agricultural viability. The Southern phase employed analogous techniques on a grander scale, with enhanced pumping infrastructure to handle the increased volume. The project faced significant hurdles, including material shortages in the post-World War II era that slowed procurement of construction resources, compounded by adverse weather that postponed dike closures. Flooding risks during initial drainage were addressed through the strategic design of peripheral lakes, such as the border lakes, to regulate seepage and prevent uneven settling. By 1957, the Eastern Flevopolder was deemed arable, with the Southern following in 1968 after further stabilization; the overall endeavor, spanning nearly two decades, transformed the landscape for agriculture and settlement.

Physical Geography

Topography and Land Use

The Flevopolder spans 970 km² of reclaimed land and exhibits a predominantly flat topography, characteristic of reclaimed land, with the surface lying approximately 3 to 5 meters below sea level on average. This low elevation stems from the drainage of the former Zuiderzee seabed during the mid-20th century reclamation, resulting in minimal natural relief and a landscape engineered for uniformity. The terrain's design incorporates geometric patterns of rectangular fields, ditches, and canals, optimizing water drainage and agricultural efficiency across the expansive polder. Soils in the Flevopolder consist primarily of clay-rich marine sediments deposited during the IJsselmeer enclosure phase, offering high fertility for crop production due to their nutrient content and water-retention properties. Peat layers occur in localized depressions, particularly in areas like Southern Flevoland, where they contribute to ongoing through oxidation. Upon initial reclamation in the and , soils faced salinization from residual seawater, which was mitigated by extensive flushing with freshwater from the , rendering the land viable for agriculture within a few years. Contemporary relies on targeted networks and fertilization to sustain productivity, addressing challenges like compaction in clay soils and nutrient depletion. Land use in the Flevopolder prioritizes , which covers approximately 57,600 hectares (about 59% of the land area), dominated by arable farming of crops such as potatoes, onions, and cereals in large, consolidated fields. Urban and residential development accounts for about 10% (roughly 97 km² dry land), centered in planned cities like and to accommodate . Nature reserves and semi-natural areas cover approximately 30% (290 km²), including Nieuw Land National Park with protected sites like the and components of the National Ecological Network, fostering amid the intensive landscape. The remaining ~15% includes infrastructure, roads, and inland water bodies supporting connectivity and drainage. Infrastructure is integrated into the polder's grid-like layout, with major roads such as the A6 motorway and N302/N307 provincial routes providing east-west and north-south access, alongside the Hanzelijn railway connecting to for efficient transport of goods and people. These elements, planned during reclamation, minimize disruption to farmland while enabling large-scale operations.

Hydrology and Water Management

The Flevopolder is protected by an extensive network of ring dikes totaling over 145 kilometers, which enclose the reclaimed land and separate it from surrounding bodies of water such as the and . These dikes, constructed during the mid-20th century as part of the , form a critical barrier against flooding, with the Eastern Flevoland ring alone measuring 90 kilometers. Internal water drainage relies on a dense system of canals and four major pumping stations managed by the Waterschap Zuiderzeeland, providing a combined discharge capacity of approximately 11.7 million cubic meters per day to remove excess rainwater and seepage. Freshwater for the polder is primarily sourced from the IJssel River, which is pumped into the to maintain low and stable levels, buffering the table at around -4.5 meters to support and prevent waterlogging. The Waterschap Zuiderzeeland oversees these operations across 150,000 hectares in , conducting annual dike inspections, reinforcements against storm surges, and continuous monitoring of rates, which average 5-10 mm per year (as of 2023) due to in peaty areas. These practices ensure the polder's land, much of which lies 5 meters below , remains viable amid ongoing environmental pressures. Following reclamation in the and , initial soil salinization from residual seawater was mitigated through targeted flushing programs in the 1970s, which introduced large volumes of freshwater via canals to leach salts and restore fertility for farming. Contemporary water management in the Flevopolder integrates with the national Delta Programme, enhancing resilience to sea-level rise through adaptive strategies like elevated dike designs and improved pumping efficiency, addressing projected increases in storm intensity and precipitation.

Society and Economy

Population and Urban Development

The Flevopolder, comprising Eastern and Southern and forming the primary landmass of province, experienced no permanent population during its initial reclamation in the 1950s and 1960s, but has since grown rapidly to an estimated 375,000 residents by 2023 (primarily in , , , and municipalities), driven by planned settlement and migration. This demographic expansion reflects the polder's transformation from barren land to a habitable region, with land availability post-reclamation enabling structured habitation patterns. The population density stands at approximately 387 inhabitants per square kilometer across the 970 square kilometers of land area, with the majority concentrated in the southern zones near major urban centers. The demographic profile is notably diverse, particularly in urban areas, contributing to a multicultural society. Key settlements dominate the region's urban landscape, including , home to 225,000 people in 2023 and established as a planned "new town" in 1976 to accommodate housing overflow from the Amsterdam metropolitan area. Almere's design emphasized affordable, modern residential development, evolving into Flevoland's largest city with expansive neighborhoods; as of 2025, its population reached 230,000. , the provincial capital since Flevoland's formation in 1986, serves as an administrative hub with 83,000 residents in 2023 and features a central layout focused on government functions and services. These cities anchor the polder's southern concentration, where over half the province's population resides. Urban development unfolded in distinct phases, beginning with small farming communities in the and in Eastern and Southern , where initial settlers focused on amid the post-reclamation landscape. From the onward, government-led plans accelerated rapid , shifting emphasis to residential expansion and infrastructure to support growing commuter populations linked to the . Contemporary growth incorporates sustainable features, including eco-districts in Almere Poort, which integrate green spaces, energy-efficient housing, and community-oriented designs for modern expansions. Supporting this evolution is robust social infrastructure, encompassing numerous schools across municipalities to serve the youthful demographic and hospitals like Flevoziekenhuis in , providing specialized care to the region. Transportation networks facilitate connectivity, with the Flevolijn railway linking and to since , complemented by highways such as the A6 for regional access.

Agriculture and Industry

The Flevopolder features extensive totaling approximately 85,000 hectares, dedicated predominantly to arable farming on its fertile clay soils. This reclaimed land supports high-productivity crop cultivation, with key staples including seed potatoes, , and sugar beets, alongside significant areas for onions and flower bulbs. production, focused on and pigs, complements the arable sector but occupies a smaller share, with farms integrating crop-livestock systems for efficiency. Agricultural yields in the region often exceed national averages—for instance, seed onion production reaches 44,000 kg per hectare compared to 15,000 kg elsewhere—owing to the uniform soil quality and advanced from the polder's water management infrastructure. Farmer cooperatives, such as Agrifirm, play a central role in providing inputs, marketing grains and other produce, and facilitating collective bargaining to enhance economic resilience. Beyond farming, the Flevopolder hosts centered on and , leveraging its central location and links via the A6 highway and . Notable facilities include ' potato processing plant in , which expands to meet demand for frozen products, while modern parks like P3 Lelystad and Logicor's developments offer over 40,000 square meters of sustainable warehousing for distribution. Emerging tech and biotech sectors are growing in , with clusters in high-tech agri-food systems, including machines and precision equipment for crop monitoring. contributes through at the reserve, drawing around 100,000–150,000 visitors annually for guided safaris and , supporting local services without dominating the economy. Economically, the Flevopolder's activities underpin Flevoland's of approximately €16 billion as of 2023, with and related processing forming a foundational pillar despite comprising only about 1.9% of the national GDP share. stood at 4.3% in 2023, aligning with the Dutch average and reflecting stable job markets in rural areas. Employment patterns have evolved since the , when dominated over 70% of provincial jobs, to a more diversified structure where services now account for around 40% of employment, driven by , tech innovation, and urban expansion in and . Innovations in the region emphasize amid challenges like subsidence. Greenhouse , though smaller than in western provinces, integrates with open-field farming to produce and ornamentals, contributing to the national output through energy-efficient designs. Precision farming technologies, including GPS-guided machinery and data analytics for variable-rate inputs, are widely adopted to optimize resource use and mitigate fatigue from intensive cultivation, with pilot projects demonstrating reduced needs by up to 20%. These practices align with broader Dutch goals for circular , enhancing long-term productivity on the polder's engineered lands.

Environment and Ecology

Natural Features and Biodiversity

The Flevopolder hosts a mosaic of ecosystems shaped by its recent creation from reclaimed land, featuring prominent wetlands, woodlands, and coastal zones. The Oostvaardersplassen, a 56 km² wetland reserve, stands as a flagship example, initiated as a rewilding project in the 1980s through the introduction of large herbivores such as Konik horses and red deer to foster natural grazing dynamics and habitat diversity. The Knarbos woodland, a central forested area planted primarily with deciduous trees in the 1970s, supports understory vegetation like ferns and fungi, contributing to the polder's wooded habitats. Along the IJsselmeer shoreline, coastal dike landscapes incorporate elements of dunes and marshes, enhancing connectivity for migratory species. Biodiversity in the Flevopolder thrives across these habitats, with over 300 bird documented province-wide, including breeding populations of spoonbills and wintering geese in the freshwater marshes of the . These marshes also sustain diverse amphibians and fish communities, while the overall region records at least 3,205 animal and plant in key reserves like Nationaal Park Nieuw Land. Approximately 23% of Flevoland's land is designated as nature areas, surpassing the national average of around 20% for terrestrial nature and forests. Ecosystems in the emerged primarily through spontaneous succession after drainage in the mid-20th century, with initial soils derived from sediments providing a base for pioneer vegetation and colonizing species. This process has yielded a diverse array of species, including wetland orchids. The polder's managed water systems, while not fully endorheic, create semi-isolated basins that promote species accumulation and in isolated habitats.

Conservation and Challenges

Conservation efforts in the Flevopolder focus on protecting its unique ecosystems through targeted management and international frameworks. The Oostvaardersplassen, a 56 km² wetland reserve, is managed by Staatsbosbeheer, the Dutch state forestry agency, which has implemented rewilding principles since the 1980s to foster natural processes and biodiversity. However, rewilding debates intensified between 2018 and 2020 following a harsh winter that caused widespread animal starvation, prompting public outcry and policy shifts toward supplementary feeding and controlled culling to stabilize herbivore populations at sustainable levels, such as targeting approximately 500 red deer and 350–550 Konik horses. As of 2024, populations are maintained near these targets, with around 1,100 red deer and 350 Konik horses reported. Flevoland hosts several sites, including the and the Lepelaarplassen, collectively covering approximately 60 km² of protected land essential for bird and under EU directives. These areas receive EU funding to support restoration initiatives, such as enhancing wetland connectivity and habitat rehabilitation, building on the 's early EU-backed development as a model for European wilderness preservation. Ongoing challenges threaten the polder's sustainability, particularly from climate change and environmental pressures. Sea-level rise projections for the Dutch coast indicate an increase of up to 0.5 meters by 2100 under moderate scenarios, necessitating upgrades to the extensive dike systems that enclose the low-lying Flevopolder to prevent flooding. Soil subsidence, driven by peat compaction and drainage, occurs at rates of about 0.5–1 cm per year in some areas, exacerbating vulnerability to water ingress and requiring ongoing land elevation measures. Additionally, invasive species from the adjacent IJsselmeer, such as the zebra mussel and round goby, pose risks to native aquatic ecosystems by altering food webs and competing with local biodiversity. Mitigation strategies emphasize adaptive approaches to build resilience. Adaptive water management in involves improving drainage infrastructure and flexible controls to cope with rising water levels and , drawing from broader Dutch delta plans. corridors, such as the planned Kotterbos-Horsterwold link and connections to the region, facilitate species migration between reserves, enhancing ecological connectivity across the . Wetlands in the region also contribute to , trapping CO₂ through vegetation and soil processes to offset emissions, though exact regional figures vary with restoration scale. Looking ahead, projects like the Marker Wadden archipelago in the nearby aim to create new islands and marshes that bolster Flevopolder ecology by improving and providing habitat buffers against influences. Public controversies surrounding , particularly the 2018 culling at , continue to influence policy, highlighting tensions between non-interventionist ideals and ethical concerns over in managed reserves. These debates underscore the need for transparent, community-engaged strategies to ensure long-term conservation success.

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