=Wadi Lahami=, which enters the sea north of the peninsula of Ras Benas, is well known by reason of the easy pass over the main watershed at its head forming an important means of access to Berenice from the west. At this point, four kilometres north-east of the white quartz cone called Marwot Elemikan, the watershed is sandy, level, and low, being only 590 metres above the sea. The drop on crossing the watershed is fairly rapid, the wadi winding about among the hills in a general north-easterly direction. About six kilometres below its head, Lahami receives the =Wadi Um Karaba=, which drains the south face of Gebel Abu Gurdi. A little further on, =Wadi Eidab= enters from the south-east; this feeder is said to head in a rough steep pass over the hills into the Wadi Abu Daba. After passing between the high hills of Gebels Um Goradi and Um Gunud, Wadi Lahami receives the short =Wadi Um Gunud=, in which there are two well known galts, or rock basins forming reservoirs of rain water; these contained good supplies in 1906-7. Lower down, Wadi Lahami crosses a stony sloping plain, where it receives the drainage from the north and east flanks of Gebel Abu Gurdi and from the mountains to the north of it, by a series of feeders, the principal of which are =Wadi Um Rishan=, =Wadi Um Homar=, and =Wadi Sefent=. East of the plain there is a sort of shunt or loop-line of Wadi Lahami, called the =Wadi Abreik=, which is preferred to the main channel for a road. Just receiving Wadi Sefent, Wadi Lahami turns sharply eastward, and then north-eastward, receiving as feeders =Wadis Um Khuzama=, =Um Ghobasha=, and =Gumudlum=, draining Gebels Um Sellim and Gumudlum to the north; these feeders are said to contain natural reservoirs full of water after rain. From the south, Lahami is fed by the =Wadis Um Eshub= and =Abu Marwa lil Lahami=, draining the lower hill country. The lower course of Wadi Lahami has not been traced in detail. It passes north-west of the well marked granite peak called Gebel Um Huk, as remarked above, and reaches the sea north of the peninsula of Ras Benas. To get to Berenice, one leaves Wadi Lahami about twenty-four kilometres below the pass at its head, and turns off south-east up the tributary Wadi Abu Marwa, which leads to Wadi Naait by an easy road. Wadi Lahami is well supplied with trees; it presented a very green appearance early in 1906, but the absence of rain for a year made it much more desolate looking in 1907, all the foliage being then blackened and withered. Its length is approximately fifty kilometres, its average slope twelve metres per kilometre, and the area of its basin is about 650 square kilometres.