To the north of O Shakafa there extends a great tract of high hills, divided into two portions by the northward-coursing Wadi Orgem. The western portion of this hill-tract culminates in =Gebel Orgem=, the two peaks of which rise respectively to 779 and 775 metres above the sea, while its northern end forms the high sand-swathed hill called =Baqari Daba=. The eastern portion of the tract, containing the important wells Bir Um Bishtit and Bir Meisah, as well as the galts of Meis-heit-ar, is rather more complex, and is cut into two parts by the Wadi Um Bishtit. Its northern part ends in a conspicuous gneiss hill called =Adar Aweib Um Bishtit=, while the hills immediately north of O Shakafa are called =Gebel Meis-heit-ar=. =Gebel Adar Qaqa= is a very conspicuous granite mountain about twenty-three kilometres west of Hadal Aweib Meisah. Its highest peak is in latitude 22° 13′ 47″, longitude 35° 19′ 0″, and rises rather precipitously to 1,606 metres above sea-level. Adar Qaqa is drained principally by the Wadi Hasium, which courses northward past the western side of the mountain. =Gebel Soaorib= is a rather long mountain range which adjoins the south part of Adar Qaqa and sweeps round to the south-east, forming the main watershed. Its highest point is 1,469 metres above sea-level. Its north-western face is drained by Wadi Mantil Hasium, which forms one of the heads of Wadi Hasium. The north-eastern flanks are drained by the Wadi Haiyo and other feeders of Wadi Soaorib, while the south-west faces drain into the Wadi Kirir and the Miti-Kwan, tributaries of Wadi Alaqi. =Gebel Leqaq= (1,192 metres) and =Gebel Um Seleim= (1,098 metres) are two mountains, both with long northward spurs, lying north-east of Adar Qaqa, between that mountain and the Wadi Soaorib. They are drained by various feeders of the Wadis Hasium and Soaorib, the principal being the Rod Anut Berer, which runs northward from between two mountains to join Wadi Hasium, and the Wadi Hankuk, which rises to the south of Gebel Leqaq and courses round the south-east flanks to join Wadi Soaorib. To the north of Gebels Leqaq and Um Seleim there stretches a sandy plain, over which the Wadis Hasium, Ibib, and Soaorib pursue their northward course. Low hills rise here and there from this plain, the most conspicuous being =Gebel Hamra Tit=, a double-peaked granite hill, rising to 642 metres above the sea; =Kulet Meigrum= and =Kulet Tinasal= are two somewhat smaller hills situated respectively six kilometres north-north-east and six kilometres east-north-east from Gebel Hamra Tit.