The =Hills on the Peninsula of Ras Benas= are sharply marked off into two portions by differences of colour. The most striking are the dazzling white hills of gypseous limestone which form a narrow sinuous broken plateau nearly along the long axis of the peninsula. The highest points of these white hills are 188 metres above the sea. Deep ravines cut up the plateau and separate it into more or less detached hills. The surface of the gypseous rock is very rough, and frequently weathered into knife-like projections which cut one’s hands and boots badly in climbing. Near the tip of the peninsula the gypseous beds contain a little sulphur in places, and there are some shallow pits which seem to have been dug for exploiting that mineral. But the quantity appears far too small to be of any commercial value, and the pits were probably only exploratory trial holes. The other hills on the peninsula are darker in colour, being chiefly diorite. They form two masses, one near to where the peninsula joins the main land, and the other on the south side of the peninsula twenty kilometres east of Berenice. The highest point of the first-named group is 276 metres, while that of the second is 197 metres, above sea-level. All the hills on the peninsula are quite separated from those of the main land by the broad sandy plain through which Wadi Mukhit courses south-eastwards to the sea. =Gebel Batoga=, a granite mountain fifteen kilometres south-east of Berenice, is sharply marked off from the other mountains near it by its light colour. It is a great boss of acid granite seamed with dykes, having two main peaks. The highest (central) peak rises to 802 metres above sea-level; the southern peak, surmounted by a triangulation beacon in latitude 23° 49′ 37″, longitude 35° 21′ 9″, is seventeen metres lower. Gebel Batoga is drained from the north by feeders of the Wadi Kalalat, and from the south by the Wadi Kunserob. There is a good water source, Galt Batoga, at its north-east foot, consisting of a rock basin which holds a good supply of water for a long time after rain, situated in a small gully close to the Wadi Kalalat, the floor of which is here about 160 metres above sea-level.