What is called when a river forks?

A river fork is called a confluence. A confluence occurs when two or more rivers meet and join together to form a single river. The point at which the rivers meet is called the confluence point. Confluences can occur between two rivers of similar size, or between a larger river and a smaller tributary. The term "confluence" can also be used to refer to the meeting point of two streams, creeks, or other bodies of water.