Schematic map of the implantation of megaliths in France. The green areas (Brittany, Pays de la Loire, Poitou, Limousin, Quercy, Causses, Languedoc, Ardèche) and orange (Corsica) mark the regions of strong implantation of dolmens, menhirs and cromlechs. Fewer megalithic monuments are encountered in the other areas marked on the map.