+A **River Basin** is the expanse of land where water from [Rain](/wiki/rain), snowmelt, and streams drains into a single river and its tributaries. This unified system collects and channels all surface flow, eventually leading to an [Ocean](/wiki/ocean), lake, or larger river.
+## See also
+- [Drainage Basin](/wiki/drainage_basin)
+- [Watershed](/wiki/watershed)
+- [River](/wiki/river)
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