It starts at the "source" or "head/headwaters"--usually a lake or spring.
some rivers start at springs, where ground water reaches the surface. others start at the ends of melting glaciers or are the outlets of lakes.
The Mississpi River starts in Mississippi.
No river in India starts with the letter U.
No river in India starts with the letter X.
No river in Australia starts with the letter X.
The Nile River Starts at Lake Victoria.
At the souce of the river
No river in Hungary starts with the letter E.
No river in the United States starts with the letter X.
No river in Britain starts with X. If you need a river starting with X, the Xingu River is a major river in Brazil and the Xi River is in China.
it starts from melting of glacier
The source of a river is where the river starts.
It is the point where the river starts.