It is called the flood plain.
Flood plain
Flood plain
Floodplain
farter
Floodplain
Floodplain
Floodplain
farter bank
ping pong on a donkey cage!
A foodplain is a flat or nearly flat land adjacent a stream or river that stretches from the banks of its channel to the base of the enclosing valley walls and experiences flooding during periods of high discharge.
The mature stage of river development is characterized by flat floodplains. During this stage, the river has carved a wide valley and deposited sediment along its banks, creating a broad, flat floodplain that may experience periodic flooding.
The areas beyond the Genesee River Valley are generally relatively hilly and dissected. The valley itself features steep banks and rugged terrain, which transitions into more rolling hills and uneven landscapes in the surrounding regions. This topography is characteristic of the Appalachian Plateau, contributing to a varied landscape that includes ridges, valleys, and gorges.