=Wadi Korbiai= and =Wadi Meneiga= have their heads only separated by a narrow mountain ridge, but there is no possible track over this ridge from one to the other. In each case the wadi contains two water sources near its head, and the limit of “navigability” of the wadi is formed practically by these sources, above which there are steep stony gorges. =Bir Korbiai= consists of two wells, both situated at the foot of a sudden drop in the rocky bed of Wadi Korbiai, about 150 metres apart, sunk in the bouldery alluvium; there is some rude timbering at the mouth of the wells over which a large stone is placed to prevent infilling by downwash. In December 1907 both wells contained abundance of excellent water, only a metre below ground level. Both wells are easily accessible, though the road to them is stony. The wells are stated to yield good supplies for three or four years after rain has fallen, but after longer drought they only yield a little. Below the wells, Wadi Korbiai sweeps round in a semicircle of about three kilometres radius round the west flank of the hills to join Wadi Meneiga. On its right side are the steep slopes of Gebel Korbiai, but on the left is lower hill country. Small feeders enter from both sides. The bed of the wadi is stony, but there are a fair number of trees in it. Only a part of the drainage of Wadi Korbiai turns eastward to join Wadi Meneiga in forming Wadi Kreiga; the other part pursues a northerly course into the Wadi Atluk, a tributary of Wadi Madi. =Bir Meneiga= is important, not only as giving a perennial supply of good water, but also as marking a point on the administrative frontier of Egypt and the Sudan. It consists of two springs in the stony bed of Wadi Meneiga, near its head. The northern spring is taken as marking the frontier; its position is latitude 22° 47′ 8″ N. longitude 35° 12′ 20″ E., altitude 605 metres above sea-level. The southern spring is about 320 metres further up the wadi, at a level four or five metres higher. Each of the springs consists of a tiny pool among the rocks of the wadi floor, easily accessible to camels. The pools only contain eight or ten gallons each, but camels can drink as fast as they like and the pool keeps full. The water is excellent. There are numerous ruins at Bir Meneiga; they consist of rude rubble hovels and extend for over a kilometre down the wadi below the springs.