The Cévennes mountains run from southwest (Cause Noire) to northeast (Monts du Vivarais), with the highest point being the Mont Lozère (1702m). The Mont Aigoual (1567m) is on the border of two departments. The Loire and Allier flowing towards the Atlantic Ocean, as well as the Ardèche and tributary Chassezac, Cèze, the different rivers Gardons to the Rhône, Vidourle, Hérault and Dourbie that flow to the Mediterranean Sea, have their headwaters in the Cévennes. Cévennes National Park was created in the region in 1970 and the Parc Naturel Régional des Monts d'Ardèche also preserves some of the natural areas. Two canyons are near the region: the Gorges de la Jonte (the Jonte gorge) and the Gorges du Tarn (the Tarn gorge). This is a socio-economic marginal region, while bio-geographically, there is altitudinal stratification and a gradient between the mountainous centre and the mediterranean littoral ecologies.