Wadi Ad Dawasir and Its Hinterland
Wadi Ad Dawasir is the only old river system crossing the cuesta landscape of central Saudi Arabia in its southern part. The breaching channel breaks its way through the complex of Paleozoic and Mesozoic strata for about 200 kilometers. The tributaries of the upper part of this old river system collected the surface runoff from almost the entire Al Hijaz highlands between the present towns of At Taif and Abha. The mouth of the river was to be found at the western slope of the large continental basin of the present Rub’ Al Khali. The recharge area of this river system covered more than 150,000 square kilometers. The main tributaries were the present Wadi Tathlith, Wadi Bishah, Wadi Ranyah and Wadi Subay’ (see Fig. 77).
KeywordsLava Flow Recharge Area Eolian Sand Basalt Flow Arabian Shield
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