Where is a river mouth located on land?

A river mouth is located at the point where a river flows into a larger body of water, such as an ocean, sea, or lake. It typically marks the transition from freshwater to saltwater, depending on the type of water body it enters. The river mouth can often be characterized by deltas or estuaries, where sediment deposition occurs, creating rich ecosystems. This area is crucial for wildlife and often serves as important locations for human activities like fishing and shipping.