Please rephrase - the question is unclear.
The plural form of the noun river is rivers.
Kanawha River.
The two rivers that form the Ohio River are the Alleghenyand Monongahela rivers.
No.
It is a river.
the Rhine river
A river valley forms from a river from the river going into a valley
The possessive form of the singular noun river is river's.example: The river's current is too strong for swimming.
At the mouth of a river.
No -- it was the Colorado River.
The Yalu River and the Tumen River form the northern border of North Korea.
Water.