alluvial plain

American  

noun

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

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Etymology

Origin of alluvial plain

First recorded in 1955–60

Example Sentences

Sediment from the Midwest, distributed through the alluvial plain by regular floods over millions of years, created Louisiana.

From Slate • Jun. 18, 2019

Bangladesh has far and away the highest population density of any sizable nation — around 3,000 people per square mile pack the alluvial plain that spans most of the country.

From Washington Post • Sep. 29, 2017

Ferme Descoubet lies at the far western edge of the Gers, near where the dense hills of the Gascon heartland flatten out into the alluvial plain of the Adour River.

From New York Times • Mar. 15, 2017

An alluvial fan spreads out into a broad alluvial plain.

From Textbooks • Jan. 1, 2017

The eastern portion of the district is the ordinary alluvial plain of the Gangetic delta; the western part consists of undulating beds of laterite resting on a rock basis, and covered with small scrub jungle.

From Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7 "Bible" to "Bisectrix" by Various