It's called a divide.
The Colorado River.
Because it is the land area that supplies water to a river system :)
Watershed- the area of land where all of the water drains into a common water body, such as a river, lake, or ocean.
the main river and all of its tributaries are called a river system. The land drained by the river system is called a drainage basin. Drainage basins are separated by the high land in between, known as a divide or watershed.
river systema river system.
The land area that supplies water to a river system.
in the Appalachian Mountains
in the Appalachian Mountains
A water catchment area.
Port Catoosa
The streams that contribute to a river system are called tributaries.