The local Arabs stated that these downrushes of water, which they term “seil,” occur on an average at about ten-year intervals; the last one occurred seven years before that of 1902. The part of the basin of Wadi Alaqi falling within the limits of the district described in this volume includes the whole country west of the main watershed between the parallels of 22° and 23°. This area is drained by numerous tributaries of Alaqi, all entering the main wadi from its north side. The following is a brief description of these tributaries, commencing with the uppermost (easternmost) of them. =Wadi Himeitra= is a small wadi draining the south face of Gebel Himeitra. It contains a well, =Bir Himeitra=, at the foot of the mountain, which is said to yield constant supplies of water. Below the well, Wadi Himeitra continues for about ten kilometres in a south-westerly direction, joining the Wadi Alaqi about seven kilometres above the ruins of Darahib. The =Miti Kwan=, the next tributary of Alaqi, has its heads in the north flanks of Gebel Himeitra. Near its head it receives as feeders from the north-east the =Wadis Kirir= and =Duag=, draining mountains of the same name which form part of the Adar Qaqa range. About fourteen kilometres further down its course, the Miti Kwan receives the =Wadi Merau=, which drains the hills of the main watershed round Eir Arib. Below the point of influx of Merau, the Miti Kwan pursues a very winding course among the hills for some eleven kilometres, then receives from the north the =Wadi Miaus=, a small wadi with many branches among the hills and containing a well, =Bir Miaus=, about seven kilometres up from its mouth. After receiving Wadi Miaus, the Miti Kwan continues a winding course for about nine kilometres and enters the Wadi Alaqi on the 22nd parallel, about fifteen kilometres below the ruins of Darahib. A well-known road, connecting the Wadi Alaqi with the Abu Hodeid and Meisah wells, leads up the Miti Kwan for a distance of some twenty-three kilometres, and then passes northwards over a stony plain, crossing the watershed into the head of Wadi Hasium, in which is Bir Kagog. =Wadi Dageina= is a small many-branched tributary of Alaqi, draining the hills east of Gebel Egat. =Wadi Alfawi=, which enters Wadi Alaqi a little lower down its course, is likewise a small wadi draining the hilly tract east of Gebel Egat; there are some old mines on its western side close to its junction with Wadi Alaqi.