Floodplain

//ˈflʌdˌpleɪn// noun

Definitions

Noun
  1. 1
    A low-lying plain adjacent to a river subject to flooding during periods of high rainfall or at high tide.

    "Near-synonyms: bottomland, bottomlands"

  2. 2
    a low plain adjacent to a river that is formed chiefly of river sediment and is subject to flooding wordnet

Etymology

From flood + plain.

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