They cover a quarter of our territory
25% of the area of the Park / between 800 and 1,100 metres
4 main Causses: Sauveterre, Méjean, Larzac, Noir
Huge plateaux, the Causses are made up of limestone lain down when the sea covered the region, 200 million years ago. They are separated by the Dourbie, Jonte and Tarn gorges, veritable canyons up to 500 metres deep carved in the thick beds of limestone. The upper parts of the gorges consist of steep rock walls containing many caves. At the feet of these cliffs, huge rockfalls spread across the softer rocks.
The area owes its Bordeaux colour to the oxidation of the iron contained in the rock and the soil.
Between 250 and 550 metres
It is mainly composed of sandstone lain down in the Palaeozoic era, between 300 and 250 million years ago. It is drained by the Dourdou and Rance rivers.
The climate is hot and dry in summer, while the abundant water favours cereal production.