The lesser stream is know as being a tributary of the greater stream or river.
A tributary.
the mouth
Tributary
tributary
It is called a tributary.
A Tributary!
The small streams are tributaries to the river.
A tributary.
Snake River
The river that feeds into Hoover Dam is the Colorado river.
These are called predators.
A Parasite
When one river meets another, it is called a tributary.
it is called the tumber river
The Little Tallahatchie River feeds Sardis Lake in MS.