+A **drainage basin**, also known as a watershed, is a natural land area where all surface water converges and drains into a common outlet, such as a [River](/wiki/river) or [Lake](/wiki/lake). Its boundaries are defined by a topographical ridge, or [Watershed](/wiki/watershed), channeling water from precipitation across its surface.
+## See also
+- [River](/wiki/river)
+- [Watershed](/wiki/watershed)
+- [Hydrology](/wiki/hydrology)
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