=Gebel Hamrat Selma= is a high ridge rising from the plain about fifteen kilometres south-west of Gebel Migif. I did not approach it closely, but fixed the position of its highest point, which is 761 metres above sea-level, by triangulation. =El Nahud= (the breasts) is the name given to two very remarkable conical hills of volcanic rock rising from the plain on the north side of Wadi Natash to the south of Gebel Hamrat Selma. The two hills are about five kilometres apart, one being south-east of the other. The north-eastern cone is the sharper of the two, but they have both the same altitude of 662 metres above the sea and rise about 130 metres above the surrounding country. =Gebel Abu Khrug= is a granite hill-mass with a remarkably sharp high peak, about twenty-five kilometres south-west of Gebel Migif. The summit, which is surmounted by a triangulation beacon, in latitude 24° 38′ 57″, longitude 34° 16′ 19″, has an altitude of 870 metres above sea-level. Abu Khrug, from its striking Matterhorn-like shape and its situation in fairly open country, is a conspicuous landmark for great distances. The Arabs who were sent to erect the beacon stated that the ascent was very difficult. =Gebel Sufra= is a mass of rather flat-topped high hills, partly of volcanic origin, about eighteen kilometres west of Abu Khrug, on the north side of Wadi Shait. The triangulation beacon on the summit is in latitude 24° 38′ 42″, longitude 34° 4′ 13″, at a height of 690 metres above sea-level, and 340 metres above the well of Um Gubur, which is in the Wadi Shait about three kilometres to the south-east. =Gebels Nazla= and =Um Serg= are moderately high hills lying to the south of Gebels Sufra and Abu Khrug, between the Wadis Shait and Natash. =Gorf el Natash= is a syenite hill on the south side of Wadi Natash, about five kilometres south-west of Bir Masur, while =Gebels Muktil= (470 metres), =Derera=, and =Um Goraf=, are prominent hills lying still further south near Wadi Antar. PLATE VIII. [Illustration: View from Gebel Migif, looking east, showing the Hafafit and Nugrus Ranges.] [Illustration: View from Gebel Migif, looking south-west, showing Gebel and Wadi Dweig.] =Gebel Ras Shait= is a group of high rugged-looking reddish hills, probably of granite, at the head of Wadi Shait, near Gebels Nugrus and Migif. Its highest peak rises to 1,019 metres above sea. The west face drains directly into Shait, while the eastern and northern slopes drain into Wadi Gerf, which joins Shait far to the south-west. Between Gebels Migif and Ras Shait is a small range of hills dividing Wadi Shait from the head of Wadi Hafafit; across the south end of this range, which is composed of dark schists with white granite at its western foot, there runs a zigzag pass, fairly easy for camels, to the head of Wadi Nugrus.