A floodplain is the flat area around a river that is covered in times of flood. A floodplain is a very fertile area due to the rich alluvium (fine sediment) deposited by floodwaters. This makes floodplains a good place for agriculture. A build-up of alluvium on the banks of a river can create levees, which raise the river bank.
Images for kids
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Paraná River floodplain, at its confluence with the headstream of the Paranaíba on the right and the Verde River, near Panorama, Brazil
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Gravel floodplain of a glacial river near the Snow Mountains in Alaska, 1902
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This aggradational floodplain of a small meandering stream in La Plata County, Colorado, is underlain by silt deposited above a dam formed by a terminal moraine left by the Wisconsin Glacier.

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Floodplain Facts for Kids. Kiddle Encyclopedia.