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The new Geological map at a scale of 1/250 000 is published by the Belgian Geological Survey.
1GE GSB 1:250.000 surface Geologic Unit (OGE_1M_surface_GeologicUnit)
Geological map of Belgium
1GE GSB 1M surface Geologic Structure (OGE_1M_Surface_GeologicStructure)
GSB 1:1M-scale surface Geologic Structure