To the west of the Um Harba and Awamtib ranges there is open country, formed by a great sandy plain, over which the Wadis Ghadrib and Timsah pursue their northward courses to join Garara, and the monotony of which is broken at intervals by extensive masses of moderately high sandstone hills. The principal of these hill masses are Gebels Nuggur, Mulgata, Ziraga, and the Abu Hashim Hills. =Gebel Nuggur=, marked by a cairn, lies seventeen kilometres west of Um Harba, and a little east of the Wadi Timsah; it forms a detached north-westerly extension of Gebel Dagalai. =Gebel Mulgata= (545 metres) and =Gebel Ziraga= (553 metres), both marked by triangulation cairns, are the chief members of a long line of sandstone hills separating the Wadis Timsah and Ghadrib. The =Abu Hashim Hills= extend for great distances south and west of Bir Abu Hashim; the triangulation beacon on the hill west of the well in latitude 23° 41′ 44″, longitude 34° 3′ 33″, is 386 metres above sea, and sixty-six metres above the wadi floor, but other hills of the group further south attain higher levels. =Gebel Mowisat=, seventeen kilometres south of Gebel Ziraga and a few kilometres west of the Wadi Timsah, is a granite hill capped by sandstone. It is drained by the Wadi Mowisat. A track from Aswân to Bir Um Reit passes a little north of this hill. Round the heads of the Wadi Ghadrib, about the parallel of 23° north and the meridian of 34° east, are numerous higher hills, of which the principal are =Gebels Abu Rahia= (835 metres), =Romit=, =Baid el Khuruf=, =Reietit= (825 metres), =Um Rewat=, =Um Ghalqa=, and =Um Gotto=, while between these and Gebel Mowisat are the =Hamiskul Hills=. These hills are all composed of granite, gneiss, and schists, the higher ones, such as Abu Rahia and Reietit, having sandstone capping the igneous and metamorphic rocks which build up the main masses. Gebel Um Rewat forms the divide between the basins of Wadi Kharit and Wadi Alaqi, its northern parts being drained by the Wadi Reietit, a tributary of Ghadrib, while the south flanks drain into the Wadi Um Ghalqa, a feeder of Wadi Seiga.