The end of a river is called the mouth of the river. It is the place where the river empties into another body of water such as a lake or ocean. All rivers have a starting point where the water begins its flow. This source is called a headwater.
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The Congo is second only to the Amazon in terms of water flow. It is the deepest river in the world, with measured depths of more than 230 meters (750 feet). Huge urban areas, including the capital cities of Brazzaville, Republic of Congo, and Kinshasa, Democratic Republic of Congo, sit on the banks of the river.
River bifurcation (from Latin: furca, fork) occurs when a river flowing in a single stream separates into two or more separate streams (called distributaries) which then continue downstream.