The richest area of Provence, the Côte d’Azur apart, is the west. Most of the large-scale production of fruit, vegetables and wine is based here, in the low-lying plains beside the Rhône and the Durance rivers. The only heights are the rocky outbreaks of the Dentelles and the Alpilles, and the narrow east–west ridges of Mont Ventoux, the Luberon and Mont Ste-Victoire. The two dominant cities of inland Provence, Avignon and Aix, both have rich histories and stage lively contemporary festivals; Arles, Orange and Vaison-la-Romaine hold impressive Roman remains. Around the Rhône delta, the Camargue is a unique self-contained enclave, as different from the rest of Provence as it is from anywhere else in France.