The low flat part of a river valley is called the floodplain. The floodplain is usually a very fertile are due to the river deposits.
Delta
Some low lying land types are:ValleyFarewellMarshLow pointHollowLow-lying areaSheltered spotCrooner JerryDellLow-lying wetland
A plateau is a flat highland. A Canyon is a valley formed by a river in an area where there is very low rainfall.
A floodplain, or flood plain, is flat or nearly flat land adjacent to a stream or river that experiences occasional or periodic flooding.
The low ground between two hills is called a valley.
Ibis
Valley
plateau
A wide flat-bottomed valley is typically known as a floodplain. It is a low-lying area adjacent to a river or stream that is prone to flooding and characterized by its level terrain and fertile soils. Floodplains play a crucial role in natural ecosystems and provide important habitats for wildlife.
Flat - A foolish fellow, a simpleton. Also refers to a flat-bottomed boat.Flats - Low lands, valley
it is called a plain or valley:)
floodplain
The floodplain is an area of flat land found on either side of a river that usually becomes wider as the river nears its mouth. A low watery formation of land at the mouth of a river is called a delta.