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geography
| Term | Definition |
|---|---|
| Source | The point where a river begins |
| Course | The route taken by a river as it flows into the sea |
| Tributary | A small river or stream that joins up with a larger one |
| Confluence | The point at which a tributary joins the rivers |
| Mouth | The point where a river enters the sea |
| Estuary | The part of a river mouth that is tidal |
| River basin | the area of land that is drained by a river and its tributaries |
| Watershed | The high ground that separates one river basin form another |
| Hydraulic action | The force of the moving water breaks off material from the banks and beds of the river |