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.

This dataset is a subset of Catchment Characterisation and Modelling (CCM) data version 2.1 provided by EU Joint Research Centre (JRC). 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. For further details, see http://ccm.jrc.ec.europa.eu/php/index.php?action=view=23 The catchment area data contained in CCM2 Geodatabase table Seaoutlets was subsetted by HELCOM secretariat using selection criteria to include data only within Baltic Sea catchment area. Copyright Statement:

The proprietary rights and copyright of the CCM River and Catchment data remain with the European Commission, Joint Research Centre (JRC). Reproduction for non-commercial purposes is authorised, provided the source is acknowledged. Commercial use is not permitted without prior written consent of the JRC. Reports, articles, papers, scientific and non-scientific works of any form, including tables, maps, or any other kind of output, in printed or electronic form, based in whole or in part on the data supplied, must contain an acknowledgement of the form: CCM River and Catchment Database © European Commission - JRC, 2007 as well as a reference to: Vogt, J.V. et al. (2007): A pan-European River and Catchment Database. European Commission - JRC, Luxembourg, (EUR 22920 EN) 120 pp.