The principal head of Wadi Ghadir is at an easy pass between Gebels Ghuel and Um Khariga, in latitude 24° 55′, at an altitude of about 500 metres above sea-level. Coursing south-east, it receives important feeders from gorges in the west face of Gebel Ghuel; the principal of these feeders, =Wadi Ghuel=, contains water holes, which gave an excellent supply of rain water in 1905-06. A little further along its course, Wadi Ghadir passes the low hill district called =Kurdeman=, where there are some old gold mines, and then receives as tributaries =Wadi Fegas= and =Wadi Ma-ud=, draining the mountains of Ghuel and Hangalia. Taking now a more easterly direction towards Gebel Ghadir, it receives from the north-west =Wadi Sabahia=, draining the craggy felsite hill of the same name; there are some old gold mines about a kilometre north-east of this hill, in a branch of Wadi Sabahia. The =Wadi Zabara=, an important tributary draining the north flanks of Gebel Zabara and the south-east part of Gebel Hangalia, enters Ghadir from the south-west, nearly opposite Wadi Sabahia. Wadi Zabara has itself three main heads, called by the separate names of =Wadi Atabi=, =Wadi Um Abid=, and =Wadi Um Dafiri=. There are ruins and ancient mines close to where the Wadi Atabi joins Wadi Zabara, while in the upper part of Wadi Um Dafiri are more extensive ruins and numerous ancient emerald mines, as well as a series of rock basins which were yielding good water in 1905-1906. After receiving the Wadi Zabara, Wadi Ghadir continues its course south-east past Gebel Ghadir, from the slopes of which numerous small feeders enter the main channel. Almost due south of Gebel Ghadir, in the southern one of two branches into which the wadi splits as it passes round a low island-like mass of hills, is =Bir Ghadir=, a well sunk in the alluvium of the wadi floor. When I visited it early in 1906 this well was filled by downwash, and the Arabs of the district deferred digging it out until the rock basins were empty; it is an important water source and is said to yield good supplies. The mines of Hangalia were supplied by water from Bir Ghadir in 1905, when nearer sources were dry. About six kilometres below the well, Wadi Ghadir passes close north of Gebel Allawi, where there are some old gold mines. The =Wadi Allawi=, which with its tributary =Wadi Lewewi= drains the hilly country between Gebels Zabara and Sikait, enters Ghadir a little to the east of Gebel Allawi; both Allawi and Lewewi are very tortuous wadis, their names in fact meaning “crooked” in the Ababda tongue (Lewewi is a diminutive of Allawi). =Wadi Um Gamil=, the next wadi entering the sea to the south, drains the hilly country south-east of Sikait. Very little is known about its course, the only part surveyed being the heads east of Gebel Sikait.