A 'flood plain' usually.
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.
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.
The shallow underwater plain that borders continents is called a continental shelf. It is an underwater extension of a continent's land mass that gradually slopes into the ocean. The continental shelf is an important area for marine biodiversity and is often rich in marine resources.
The definition for a flood plain is, flat land near the edges of rivers made by floods.
Artic Ocean
It flows through it.
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
The northern European plain borders the Baltic Sea to the north.
algeria
A vast semiarid grass-covered plain that usually borders a desert
Some call it a beach. Some call it a coastal plain.