Definition:
The area of land drained by a river and its tributaries (the term is synonymous with river basin). The measurable parts of a drainage basin system include: basin area, valley-side slopes, floodplains, and stream channel length, and equilibrium conditions within the system are revealed by the statistical relationships between the various parameters; for example, basin area may be directly related to total channel length.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site