=Hadal Aweib Meisah= is a conspicuous double-topped mountain of a somewhat conical shape. Its summit, marked by a triangulation beacon, is 1,224 metres above sea-level, and has the position latitude 22° 16′ 39″, longitude 35° 31′ 55″. In plan it is almost circular, three-fourths of the circumference of its base being formed by the Wadis Awitla and Lasewid (feeders of Wadi Meisah), while the remaining fourth forms a connexion by which the mountain is joined to the long ridge of Gebel Qidmib. The ascent of the mountain was made from a camp one and three-quarter kilometres due east of the summit, in a small feeder of Wadi Lasewid, close to the spring called Megwel Um Edwa. Camels cannot get quite up to the spring, but a camp can be placed a little way further down the gully at an altitude of 596 metres above sea, and the climb of 628 metres to the top of the mountain is easily accomplished on foot in about two hours. The mountain is composed of dark gabbroid rock, the summit being composed of great blocks, weathered to a rusty brown on their surfaces; the rock is highly magnetic, and the compass points several degrees east of north at the beacon owing to local attraction. PLATE XVIII. [Illustration: MAP OF THE DISTRICT OF MEISAH & WADI DI-IB. Ball. Geography & Geology of South-Eastern Egypt. Photo-Metal-Process. Survey Dept. Cairo 1910. (60-190)] =Iarih Meisah= is the name given to a tract of low granite hills with sandy interspaces, which lies to the south of Hadal Aweib Meisah. It forms the head of Wadi Baueiwai. About three kilometres west of Hadal Aweib Meisah, a high ridge, over 1,000 metres in height, courses north and south for over fourteen kilometres. The north end of this ridge bifurcates to form =Gebel Qidmib=; the Wadi Qidmib, draining northwards to Wadi Ibib, has its head between the two branches of the ridge, where there is a well called Bir Qidmib. =O Shakafa= is a very remarkable hill seven kilometres north-east of Hadal Aweib Meisah. O Shakafa derives its name, which signifies “the barrier,” from the fact that it appears to block the way to the traveller ascending the Wadi Meisah. Its crest, formed by a ridge of hard jaspery quartzite, rises precipitously from among a mass of softer rocks, some of which show remarkably brilliant colours due to iron staining. The cairn on the summit is in latitude 22° 19′ 44″, longitude 35° 34′ 42″, and 751 metres above sea-level. There is barely standing room on the top of the ridge, which needs careful climbing owing to its precipitous nature. O Shakafa is a good landmark for Bir Meisah, which lies in the wadi about three kilometres north-east of the summit; and for the easy pass of Sarob Kwan, which lies four kilometres to the south-east.