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flood plain

or floodplain

a nearly flat plain along the course of a stream or river that is naturally subject to flooding.
Origin of flood plain
First recorded in 1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for floodplain

flood plain

the flat area bordering a river, composed of sediment deposited during flooding
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for floodplain

also flood plain, 1873, from flood (n.) + plain (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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floodplain in Science
Flat land bordering a river and made up of alluvium (sand, silt, and clay) deposited during floods. When a river overflows, the floodplain is covered with water.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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