The Toulourenc, a torrential river on the north side of Mont Ventoux, has its source at the foot of the Château d'Aulan. The river has dug deep gorges in the rock of its bed, sometimes reaching 100 meters.
Starting from Buis, head towards the Col de Fontaube. The road climbs gently before straightening in the last km. Nice view of the Ventoux around a bend. At the pass, …