Washland

Washland or washes are areas of land adjacent to rivers which are deliberately flooded at times when the rivers are high, to avoid flooding in residential or important agricultural areas.

[1][2][3] They often provide for overwintering wildfowl, and several include important nature reserves.

[4][5] Examples of washlands include:

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Car on the A1040 crossing flooded Whittlesey Wash, part of the Nene Washes
Guyhirn Wash, part of the Nene Washes