The Causse de Blandas is a karstic upland delimited by the course of the Arre to the north and the Vis and the Causse de Larzac to the south. Around 800 hectares of the upland are protected as a Site of Community Importance (SCI) by the European network Natura 2000. It consists of wide, bare enclosed pasturelands, which are particularly interesting for the specific flora of chalky soils and the presence of dolmens and menhirs.