This is the 'river catchment'.
Because it is the land area that supplies water to a river system :)
the area from which water drains into a river is called the river's catchment. A river's watershed is the connecting ridges surrounding the watershed, and separating it from adjacent ones.
A water catchment area.
A water catchment area.
the drainage basin
The land area that supplies water to a river system.
The Murray-Darling is the most important river system in Australia. This system contributes to the most significant agricultural area on the continent and is home to many native animal species.
An area drained by a river or river system is called a drainage basin.
Watershed- the area of land where all of the water drains into a common water body, such as a river, lake, or ocean.
The area from which water drains into a river is called the river's watershed or drainage basin. It includes all the land and waterways that contribute runoff to that particular river system. Rainfall and other sources of water collect in the watershed, eventually flowing into the river and its tributaries.
Because it is the land area that supplies water to a river system :)