Question

What are floodplains?

Answer 1

An area of low-lying ground adjacent to a river, formed mainly of river sediments and subject to flooding.

Answer 2

here is your answer mate:    A floodplain or flood plain or flood-plain is an area of land adjacent to a stream or river which stretches from the banks of its channel to the base of the enclosing valley walls, and which experiences flooding during periods of high discharge. The soils usually consist of clays, silts, and sands deposited during floods.

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