i think it is a runoff
Every river is part of a larger river system which includes the river and any tributaries that branch off of it.
what is a river and it"s tributaries
River system.
The veins and their tributaries are collectively called the venous system. The other part of the circulation is the arterial system.
Feeder creeks, or tributaries.
tributaries
Every river is part of a larger river system which includes the river and any tributaries that branch off of it.
drainage system (guessing)
tributaries
Tributaries
Yorkshire's river Ouse's system of tributaries includes the Derwent, Aire, Don, Wharfe and Rother.
a river and all its tributaries