Amazon Basin
It's called an estuary, or in Scotland, a firth. Where it spreads out into a muddy triangle, it's called a delta.
The base level of a river is the lowest place where it can flow, generally it's mouth. Therefore if a river or stream flows into another river, then the first river's base level is the point where it joins the other river.
what is the base area for the mississippi river
The Mississippi River.
The Mississippi River.
The Colorado River
The river Don
it is called the tumber river
YES, THERE IS A RIVER CALLED CONNECTICUT RIVER.
The source or beginning of a river is called the 'headwater'. The beginning of a river is known as the source.
A stream or river called that flows into a larger stream or river is called a tributary.