stream piracy
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.
A watershed is composed of different sources of water that all run together. This might include a lake and river system.
The catchment is the correct answer. Commonly folk say 'watershed' but the watershed is the boundary (ridges etc) of the catchment.
drainage basin
oceans are mass lands cover with water in Greek it is called Pangea.
a watershed, also called a drainage basin, is an area drained by a river.
watershed
watershed
Watershed.
Technically, a watershed is the dividing ridge between two catchments. A Catchment is the area of land with a common drainage system.
Because it is the land area that supplies water to a river system :)
I believe you might be referring to a "watershed".