European Commission - Joint Research Centre - Institute for Environment and Sustainability
River Basins. Catchment Characterisation and Modelling (CCM) River and Catchment Database, version 2.1 (CCM2)
The River Basins section of the CCM2 database. The CCM2 database covers the entire European continent, including the Atlantic islands, Iceland and Turkey. It includes a hierarchical set of river segments and catchments based on the Strahler order, a lake layer and structured hydrological feature codes based on the Pfafstetter system.