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What is a river?
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake, or another river.
Where does a river begin?
A river begins at its source (or headwaters), which is often a spring, lake, or melting glacier.
What is the mouth of a river?
The mouth of a river is the point where it empties into another body of water, such as an ocean, sea, lake, or a larger river.
What are tributaries?
Tributaries are smaller streams or rivers that flow into a larger river.