alluvial plain

a level or gently sloping surface formed of sediments laid down by streams, generally during flooding.

1955–60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica

alluvial plain

flat land area adjacent to a stream, composed of unconsolidated sedimentary deposits (alluvium) and subject to periodic inundation by the stream. Floodplains are produced by lateral movement of a stream and by overbank deposition; therefore they are absent where downcutting is dominant. Any erosional widening of one bank is approximately equalled by deposition on the opposite side of the channel in the form of bar development along the inside of meander bends. Thus, the simplest floodplain is made up of a strip of sinuous scrolls immediately adjacent to the stream.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Once a swampy, alluvial plain, the region now sustains.
The lines are drawn on the alluvial plain that descends from this valley towards the sea.
Sinkhole in limestone on the alluvial plain filled with trees and brush.
Both the alluvial plain and the river channel have been significantly modified in the last century by human activities.
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