Seven Pillars of Wisdom by T.E. Lawrence

Dawn found us crossing a steep short pass out of Wadi Kitan into the main drainage valley of these succeeding hills. We turned aside into Wadi Reimi, a tributary, to get water. There was no proper well, only a seepage hole in the stony bed of the valley; and we found it partly by our noses: though the taste, while as foul, was curiously unlike the smell. We refilled our water-skins. Arslan baked bread, and we rested for two hours. Then we went on through Wadi Amk, an easy green valley which made comfortable marching for the camels.

When the Amk turned westward we crossed it, going up between piles of the warped grey granite (like cold toffee) which was common up-country in the Hejaz. The defile culminated at the foot of a natural ramp and staircase: badly broken, twisting, and difficult for camels, but short.