Oh, dude, that's easy! The term you're looking for is "watershed." It's like the VIP section for all the water that gets drained by a river. So, yeah, next time you're at a party and someone asks about the area drained by a river, just drop the term "watershed" and watch them be like, "Whoa, this person knows their stuff!"
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The area of land drained by a river is called a "catchment area". It is so-called because is the the area that catches the precipitation (rainfall).Another term is "river basin", but this is less specific.(The geographical term, "catchment area", is often used to describe the area served by, say, a school or hospital).
an area drained by a river is called pooo lol
A Basin
basin
a watershed, also called a drainage basin, is an area drained by a river.
River Basin
river basin
The area drained by a river and its tributaries.
Basin
river or lakes duhhh
A river basin is an area of land drained by a river and its tributaries.