Usually the start of a river is called its source and the end of the river is called the mouth.
The source. The beginning of a stream or river.
The starting point of a river is called a source. A smaller river that flows into a larger river is a tributary.
The start of a river is called a source.
The Mouth.
Source
The source
source.
the source
start
A stream or river called that flows into a larger stream or river is called a tributary.
The source
The beginning of the river usually starts in mountainsided areas or in small lakes. It is also called a creek or stream.
Tributary is the answer you are looking for, I believe.
it forms at the beginning of a stream or river
A small stream in a river is called a current.
The middle part of a river may be called mid-stream, mid-river or mature river.
The source or beginning of a river is called the 'headwater'. The beginning of a river is known as the source.
Are you crazy? A stream or a small river is called a TRIBUTARY.
A tributary.
River
A stream?