 The W foot (located at according to Hassanein) is 618 m high, and overcast with giant boulders fallen because of erosion.In general, the W slope constitutes an oasis, with wells, bushes and grass.The western part of the massif consists of intrusive granite, arranged in a ring shape of some 25 km diameter, ending in three valleys (wadis) towards the west, named Karkur Hamid, Karkur Idriss and Karkur Ibrahim.