The quarter southwest is composed of two big chalky trays (until 1247 meters to the mount Cargo).

Pierced of underground cave and avens (Aven Armand), the causse of Sauveterre and the Méjeans causse ares separated by the Gorges du Tarn.
     

The lack of water presents a dry vegetation, boxtrees, junipers and thistles. It is the country of sheep whose milk will serve to the manufacture of the Roquefort. Here as one wanted to tempt the experience of the réintroduction with the horse of Przewalski.