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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.

The meteorological and related activities of the WMO are coordinated by six Regional Associations (RAs), composed of WMO-Members from the respective region of the world. The current status of the RAs is published in WMO Publication No. 5: Composition of WMO (WMO 2020). For each WMO Region a “List of basin indicators (BB) and indicators of countries (C) used in international hydrological codes” is published in the “WMO Manual on Codes” (2011 ed., WMO 2018) for basin identification in international data sharing contexts. Within each WMO Region at maximum 99 WMO Basins are defined, representing a specific hydrographic region. Designated from a hydrographic perspective, a WMO Basin represents a river/lake basin in total or sub-basins of them. Coastal sections between the sea-outlets of rivers become separate WMO Basins, entire islands as are.