Definition: A river is a large stream that flows over land. It is often a perennial (year-round) water body and usually flows in a specific channel, with a considerable volume of water.
Examples:
The world's shortest river, the D River, in Oregon, is only 120 feet long and connects Devil's Lake directly to the Pacific Ocean. Africa's Nile River is the world's longest at 4,160 miles (6,695 kilometers) long.
