A drainage basin, also known as a watershed or catchment area, is the geographic area that contributes water to a particular stream, river, or lake. It is defined by topographic divides, where all precipitation within the basin eventually drains into a common outlet. Drainage basins are critical in hydrology, water resource management, and environmental studies, as they influence water flow, sediment transport, and ecosystem health.
Source Chorley, R. J., Schumm, S. A., & Sugden, D. E. (1984). “Geomorphology.” Methuen.