Tributary is the answer you are looking for, I believe.
it is called atributary
is called a stream or river that run into another stream
The Confluence
tributary
run-off
A stream or river called that flows into a larger stream or river is called a tributary.
The middle part of a river may be called mid-stream, mid-river or mature river.
A large natural stream, which may be a waterway.
A stream that runs into another stream or river is called a tributary. A river and all of it's tribunes together is a river system.
A small stream in a river is called a current.
No, a stream is actually smaller than a river.
Are you crazy? A stream or a small river is called a TRIBUTARY.
A tributary.
The difference between a river and a stream is the name applied to it by local residents, and relative size. In the same region, something called a river is usually larger than something called a stream. However, something that is called a river in one place could be the same size as something called a stream in another place.
A Tributary
I was told it was an "exotic stream."
river