From World Resources Institute‘s Watersheds of the World (2003) visualizations of some social-ecological properties of the world’s major watershed:
Water availability per person (1995)
The map shows the 114 major watersheds in the world. The map includes the largest transboundary watersheds and small basins that are representative of a particular geographic area. Omitted regions, shown in white, are primarily smaller coastal drainage basins or regions with no permanent rivers (more info).