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A river mouth is the end of a river where flows into another body of water. It is normally the sea or ocean. Where a river flows into another river, it is a tributary, and the location is a confluence.

The mouth is the opposite end of a river from its source. The mouth is where a river flows into an ocean, sea, lake, reservoir, or salt flat. It is also where an important part of the hydrological cycle takes place - the river's freshwater combining with the sea's saltwater. This can occur along an extensive stretch of the lower river called an estuary.

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8y ago

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