sentences:  It stretches from the lower end of the Höllental, below Rotbach to the valley of the Wagensteigbach, and Unteribental borders the St. Märgen plateau.A little to the west of Buchenbach, these two mountain streams merge to form the Dreisam, so Buchenbach is the starting point of the Dreisam valley.Clockwise from the north, Buchenbach borders on the municipalities of Sankt Peter, St. Märgen, Breitnau, Oberried, Kirchzarten and Stegen.