Flevopolder in the context of "Bordering lakes"

An artificial island or man-made island is an island that has been constructed by humans rather than formed through natural processes. Other definitions may suggest that artificial islands are lands with the characteristics of human intervention in their formation process, while others argue that artificial islands are created by expanding existing islets, constructing on existing reefs, or amalgamating several islets together. Although constructing artificial islands is not a modern phenomenon, there is no definite legal definition of it. Artificial islands may vary in size from small islets reclaimed solely to support a single pillar of a building or structure to those that support entire communities and cities. Archaeologists argue that such islands were created as far back as the Neolithic era. Early artificial islands included floating structures in still waters or wooden or megalithic structures erected in shallow waters (e.g. crannógs and Nan Madol discussed below).

In modern times, artificial islands are usually formed by land reclamation, but some are formed by flooding of valleys resulting in the tops of former knolls getting isolated by water (e.g., Barro Colorado Island). There are several reasons for the construction of these islands, which include residential, industrial, commercial, structural (for bridge pylons) or strategic purposes. One of the world's largest artificial islands, René-Levasseur Island, was formed by the flooding of two adjacent reservoirs. Technological advancements have made it feasible to build artificial islands in waters as deep as 75 meters. The size of the waves and the structural integrity of the island play a crucial role in determining the maximum depth.

A polder (Dutch pronunciation: [ˈpɔldər] ) is a low-lying tract of land that forms an artificial hydrological entity, enclosed by embankments known as dikes. The three types of polder are:

1. Land reclaimed from a body of water, such as a lake or the seabed
2. Flood plains separated from the sea or river by a dike
3. Marshes separated from the surrounding water by a dike and subsequently drained; these are also known as koogs, especially in Germany

The ground level in drained marshes subsides over time. All polders will eventually be below the surrounding water level some or all of the time. Water enters the low-lying polder through infiltration and water pressure of groundwater, or rainfall, or transport of water by rivers and canals. This usually means that the polder has an excess of water, which is pumped out or drained by opening sluices at low tide. Care must be taken not to set the internal water level too low. Polder land made up of peat (former marshland) will sink in relation to its previous level, because of peat decomposing when exposed to oxygen from the air.

Flevoland (Dutch pronunciation: [ˈfleːvoːlɑnt] ) is the twelfth and newest province of the Netherlands, established in 1986, when the southern and eastern Flevopolders, together with the Noordoostpolder, were merged into one provincial entity. It is in the centre of the country in the former Zuiderzee, which was turned into the freshwater IJsselmeer by the closure of the Afsluitdijk in 1932. Almost all of the land belonging to Flevoland was reclaimed in the 1950s and 1960s while splitting the Markermeer and bordering lakes from the IJsselmeer. As to dry land, it is the smallest province of the Netherlands at 1,410 km (540 sq mi), but not gross land as that includes much of the waters of the fresh water lakes (meres) mentioned.

The province had a population of about 445,000 as of January 2023 and consists of six municipalities. Its capital is Lelystad and its most populous city is Almere, which forms part of the Randstad and has grown to become the seventh largest city of the country. Flevoland is bordered in the extreme north by Friesland, in the northeast by Overijssel, and in the northwest by the lakes Markermeer and IJsselmeer. In the southeast, the province borders on Gelderland; in the southwest on Utrecht and North Holland. Outside urban areas, the land in Flevoland is predominantly used for agriculture.

The Swifterbant culture was a Subneolithic archaeological culture in the Netherlands, dated between 5300 BC and 3400 BC. Like the Ertebølle culture, the settlements were concentrated near water, in this case creeks, riverdunes and bogs along post-glacial banks of rivers like the Overijsselse Vecht.

In the 1960s and 1970s, artifacts classified as "Swifterbant culture" were found in the (now dry) Flevopolder in the Netherlands, near the villages of Swifterbant and Dronten. Other sites were uncovered in South Holland (Bergschenhoek) and the Betuwe (Hardinxveld-Giessendam).

Goeree-Overflakkee (Dutch pronunciation: [ɣuˌreː ˈoːvərflɑˌkeː]) is a delta island and an administrative municipality in the province of South Holland, Netherlands, with a population of 50,589. It is the largest island by land area in the Netherlands after the man-made Flevopolder.

Goeree-Overflakkee is separated from the islands of Voorne-Putten and Hoeksche Waard by the Haringvliet, from the mainland of North Brabant by the Volkerak, and from Schouwen-Duiveland by Lake Grevelingen.

The IJssel (Dutch: [ˈɛisəl] ; Dutch Low Saxon: Iessel(t) [ˈisəl(t)]) is a Dutch distributary of the river Rhine that flows northward and ultimately discharges into the IJsselmeer (before the 1932 completion of the Afsluitdijk known as the Zuiderzee), a North Sea natural harbour. It more immediately flows into the east-south channel around the Flevopolder, Flevoland which is kept at 3 metres below sea level. This body of water is then pumped up into the IJsselmeer.

It is sometimes called the Gelderse IJssel (IPA: [ˌɣɛldərsə ˈʔɛisəl] ; "Gueldern IJssel") to distinguish it from the Hollandse IJssel. It is in the provinces of Gelderland and Overijssel, the latter of which was named after this river. The Romans knew the river as Isala. It flows from Westervoort, on the east side of the city of Arnhem.