Drainage basin
Also known as: river basin · catchment · catchment area · water basin · watershed · watershed area
A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean.
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Defines the hydrological extent of the Brazos River
The river's 45,000-square-mile drainage basin is a critical geographic feature that dictates the regional ecology and water management of Texas.