A hydrographic basin, also known as a drainage basin or watershed, is an area of land where all surface water converges to a single point, usually a river, lake, or ocean. The study of hydrographic basins is crucial in hydrology, water resource management, and environmental science for understanding the movement and distribution of water across the landscape.
Reference: Chorley, R. J., & Kennedy, B. A. (1971). Physical Geography: A Systems Approach. Prentice Hall.