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wetland
river basin
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swamp
Most of the earths surface is covered with water. There is land under that water though, below the surface.
Wetlands
Approximately 77% of Germany's total area is covered by land, with the remaining 23% covered by water bodies such as rivers, lakes, and the North Sea.
Flats
A 'floodplain'.
The area that is normally covered by water when a river overflows its banks is called the floodplain. This area is the first part of the land to be flooded.
The flood plain