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Polder refers to a low-lying stretch of land surrounded by embankments known as dikes
Because they rely on dikes for their local crops and marshlands
polder
The European nation that has had much land reclaimed from the sea is the Netherlands. Much of the nation is below sea level and is protected by a vast system of dikes that hold the water back.
Polders are low-lying plots of land protected by dikes from a body of water. Chinampas are built up plots or "floating gardens" surrounded by water.
Levees, dikes.
Since they're surrounded by water/coastal areas, they made polders and dikes.
J. Westenberg has written: 'Kennemer dijkgeschiedenis' -- subject(s): Dikes (Engineering), History, Polders
Polders are areas of low-lying land that have been reclaimed from the sea or rivers and are protected by dikes or walls to prevent flooding. They are common in countries like the Netherlands and are used for agriculture or residential purposes. Drainage systems are essential to keep polders dry and usable.
Polders are generally associated with The Netherlands (Holland). They are low-lying tracts of land enclosed by embankments (barriers) known as dikes that form artificial hydrological entities.
There are over a dozen countries that have polders, but Holland (also known as the Netherlands) has the most and is the country most famous for them. Because so much of the land lies below sea level, it is necessary to build dikes or embankments to hold back the ocean water and prevent flooding. The Dutch first started building polders about a thousand years ago and there are now about 3,000 in their country. Polders are low lying tracts of land usually protected by embankments or dikes. Comes from a Dutch word 'poire' Land claimed from water covered sources, lakes and seas.
They first build dikes around some immersed land, then pump the water out of it (formerly using windmills), then use it for growing crops.