Fig. 2: The extent of (indirect) subterranean ecosystems protection across the European Union.
From: Perspectives and pitfalls in preserving subterranean biodiversity through protected areas
The map shows the European Union surface covered by the Natura 2000 network of protected areas (orange) overlaid on areas that have subterranean habitats (blue). Methods and data sources to generate the map and associated analyses are available in Supplementary Text 1.
