GRDC Major River Basins of the World (MRB) is an ongoing GIS project of the Global Runoff Data Centre (GRDC). It is provided for public use under the condition of full citation and reference to incorporated data from the HydroSHEDS database. This is the 2nd, revised edition 2020 and replaces the basin polygons and river lines of the edition 2007 (GRDC 2007).

Modern GIS technology allows for the delineation of basins for almost every point on the Earth’s surface. Against this background, GRDC is repeatedly asked for the provision of watershed boundaries for the gauging stations represented in the Global Runoff Data Base. The watershed boundaries of more than 7000 GRDC stations were generated using the HydroSHEDS drainage network.

WMO Basins and Sub-Basins (WMOBB) is an ongoing GIS project of the Global Runoff Data Centre (GRDC). It is provided for public use under the condition of full citation and reference to incorporated data from the HydroSHEDS database. This is the 3rd, revised and extended edition 2020 and replaces the catchment polygons of the edition 2017.