A 'flood plain' usually.
A flood plain can be described as a relatively low flat land that borders a river that is subject to flooding every few years. Most people do not like to build on a flood plain because they do not want their housing damaged every few years by floods.
An underwater plain that borders a continent is called a continental shelf. It is a relatively shallow area of the ocean that extends from the shoreline to the continental slope.
The definition for a flood plain is, flat land near the edges of rivers made by floods.
It flows through it.
Artic Ocean
A flood plain is formed when a river overflows its banks and deposits sediment on the adjacent low-lying areas. Over time, repeated flooding events deposit layers of fertile soil, creating a flat and fertile plain that is beneficial for agriculture. Floodplains help absorb excess water and reduce the risk of flooding in other areas.
Flat land near the edges of rivers formed by mud and silt deposited by floods is called a delta. There are several deltas around the world.
flood damage Flood line Flood plain
algeria
A vast semiarid grass-covered plain that usually borders a desert
rivers leave fertile soil along their banks after floods
The coastal plain of the southeast extends from the fall line to the coast. It borders the Gulf of Mexico and Atlantic Ocean.