World Drainage Systems represents the major drainage systems of the world. This layer is part of the 2014 ESRI Data and Maps collection for ArcGIS 10.2. World Drainage Systems provides a base map layer of major drainage systems of the world. ESRI. (2014). World Drainage Systems, 1990-1992. ESRI. Available at: http://purl.stanford.edu/pn587cm0240