The boundary of the drainage basin is called a drainage divide. Sometimes drainage basin is called catchment area referring to an area where water flows into a stream or a number of streams. In North America drainage basin is also called Watershed.
They are called divides
Divides are the boundaries that separate streams in adjacent drainage basin.
Drainage basin is also called catchment, catchment area, catchment basin, drainage area, river basin, and water basin. It is an area of land. All water that falls on that land flows into one river.
The catchment is the correct answer. Commonly folk say 'watershed' but the watershed is the boundary (ridges etc) of the catchment.
What is the largest drainage basin in the US?
that is what is called a basin
drainage basin
What is the largest drainage basin in the US?
What is the largest drainage basin in the US?
A stream discharges into a drainage basin. A drainage basin is a tract of land drained by a river and its tributaries
Drainage Basin
the Mississippi river drainage basin, Colorado river drainage basin, and the Columbia river drainage basin
Divides are the boundaries that separate streams in adjacent drainage basin.