When river is made?

I'm confused by your question, you know river was made from the beginning of time. Maybe you are asking "how are rivers made?". The answer to that is this:

Rivers can be formed when a lake, ocean or spring have excess water that can't go anywhere until the excess water finally finds and trickles along the lowest points in the dirt. After a long time, a river has formed.So that's how a river is made.