The best-known passes are: (I) The Bibawan in the upper Wad Sias basin (4150 ft.); (2) the Gindafi, giving access from Marrakesh to Tarudant, rugged and difficult, but low; (3) the Tagharat, difficult and little used, leading to the Dra'a valley (11,484 ft.); (4) the Glawi (7600 ft.); (5) Tizi n 'Tilghemt (7250 ft.), leading to Tafilet (Tafilalt) and the Wad Ghir.