A river basin is an area of land drained by a river and its tributaries.
a flood
It would be the flood plain or meander belt.
This area has good farmland. Especially after a flood this area would have very rich soil.
The farming area of rich land along rivers in Mesopotamia is called the Fertile Crescent. It is located between the Tigris and Euphrates Rivers.
It's called a 'flood plain'.
There isn't a city called that. There is an area of land, called 'the land of five rivers', and that is the Punjab in India.
River bank, flood plain, water meadow.
A plain is basically a large, flat area and flood plains are the large flat areas to either sides of rivers. These areas, when it rains so much that the river bursts its banks, are covered in water: flooded.
The definition for a flood plain is, flat land near the edges of rivers made by floods.
The land along a river is called a river bank.
Controlled land use, widen rivers, deepen rivers, build a dam
The narrow strip of land on both sides of the rivers is called cover flood plains