Streams run into larger rivers.
A stream or river called that flows into a larger stream or river is called a tributary.
tributary
A tributary.
A Tributary
The stream is a tributary of the river.
River, stream, waterway, brook, canal, or watercourse
Streams run into larger rivers.
It's called a tributary.
Tributary
stream, creek or either a lake or a ocean
They join together- it is called a tributary xx
current people