Bi'r Fajr Corridor

Between the Basithah plain and Wadi Sirhan, the northern Arabian plateau forms a broad stretch of dry country. Basithah lies west of the valley and was known to medieval writers for its scarcity of water. Along the depression of Wadi Sirhan, scattered watering places and grazing lands have supported movement between the al-Jawf oases and the lands to the northwest.