Buëch
The Buëch starts several kilometres to the east of col de la Croix-Haute, a mountain pass in the western side of the Massif du Dévoluy mountains, in the commune of Lus-la-Croix-Haute, Drôme department, at an elevation of about . It then flows to the southwest and gets into the Hautes-Alpes department and then flows to the south.