The source
Answer!-Usually the start of a river is called its source and the end of the river is called the mouth.
A stream or river called that flows into a larger stream or river is called a tributary.
A small stream is called a creek.
The side of a stream is usually called its bank.
It is occasionally called a sinking stream or a disappearing stream, but geographers and geologists normally call it a stream, just like another stream.
Well, the winds start from the west to start the current and then it will form the gulf stream
Tributary is the answer you are looking for, I believe.
Rivers normally start on higher ground, perhaps where there is ice melt. The drops gradually join together and become a small stream. The place where a river gets its start is called the source or headwaters.
a waterway is a large stream
a tributary
a stream
The source of a stream is called a headwater or headstream. This is where the stream initially begins, often from a spring or melting snow.