At the generic level, the official AOC Côtes du Rhône region stretches 200 km from Vienne in the north to Avignon in the south and from the foothills of the Massif Central in the west to the fore-slopes of the Vaucluse and Luberon mountains east of the town of Orange. 171 communes in the French departments of Ardèche, Bouches du Rhône, Drôme, Gard, Loire, and Vaucluse are concerned with production from the 83,839 (2008) hectares of vineyard. The average yield is 52 hectolitres per hectare. Wines of all three colours must have a minimum alcohol content of 11%.