Wiktionary
floodplains
n. (plural of floodplain English)
Usage examples of "floodplains".
Around its banks stretched extensive floodplains, some of them marshy or sheets of open water.
Here, on the floodplains and in the seasonal swamps, the well-watered, silty soil supported many annuals, herbs, legumes, vines, lilies, and arrowroots.