=Gebel Egat= is a high mountain close to the south-west of Gebel Mikbi, forming the continuation of the watershed. It has two principal peaks, two and a quarter kilometres apart, of which the south-west one is the higher, being 1,422 metres, while the north-east one is 1,277 metres above the sea. The western face of the mass is drained by the Wadi Egat, a tributary of Kharit, while the eastern flanks are cut up by feeders of the Wadi Sefent, a tributary of Wadi Lahami. =Gebels Um Sellim= and =Gumudlum= are high hill ranges forming an eastward extension of the Egat and Mikbi mountains, on the north side of Wadis Sefent and Lahami. The highest point of Gebel Um Sellim is 947 metres above sea, or about 620 metres above the floor of Wadi Lahami. These ranges are flanked by lower hills through which run various small wadis such as Um Khuzuma, Um Ghobasha, and Gumudlum, all feeders of Wadi Lahami. Some of these small wadis contain rock basins or galts which retain large supplies of water for some time after rain has fallen on the hills. =Gebel Abu Gurdi= is a great mountain in latitude 24° 0′, forming the terminal peak to the south of the Hamata group. The beacon on its summit, in latitude 24° 0′ 11″, longitude 35° 5′ 17″, is 1,562 metres above sea-level. Though in reality a ridge, Abu Gurdi from most points of view looks like a rather flat cone, surrounded by lower hills. It is on the main watershed, which crossing to the summit from Gebel Egat, continues south-eastward along a narrow ridge descending to the pass at the head of Wadi Lahami. The south-west parts of Abu Gurdi are drained by the Wadis Abu Gurdi and Elemikan, both tributaries of Kharit, while its southern and eastern parts drain into Wadi Lahami by various feeders, of which the chief are the Wadis Um Karaba, Um Rishan, Um Homar, and Sefent. Gebel Abu Gurdi could probably be ascended from the west by following up the Wadi Abu Gurdi, but in occupying the mountain as a triangulation station I descended the Wadi Lahami as far as the point of influx of Wadi Um Karaba and then ascended the latter wadi as far as the camels could get, pitching my camp two kilometres south of the summit at 804 metres above sea-level. The ascent of 758 metres to the beacon on foot from the camp occupied two and a quarter hours of fairly stiff climbing; it presented no serious difficulties, but the rock near the top is much broken up and one has to be careful lest blocks are dislodged under one’s foot. The view from the top of Abu Gurdi on a clear day must be extremely fine, but during the three days I remained there a thin haze spoiled the distant prospect, especially towards the coast; the remarkable shapes of the granite peaks of Gebel Faraid, sixty kilometres to the south-south-east, formed the most striking feature in the scene.