The intersection of the vector version of the cartogram published in: European Topic Centre of Biological Diversity (2006). The indicative map of European biogeographical regions: Methodology and development. Ed. 1. Paris: Muséum National d'Histoire Naturelle. 13 s.
The mapping procedure is based on an interpretation of the digital version of the ‘Map of Natural Vegetation of the member countries of the European Community and of the Council of Europe’ (Noirfalise A., 1987).