Wadi Sirhan

Wadi Sirhan is a wide, enclosed depression that starts in the Aljouf region in Saudi Arabia (elevation 525 m) and runs 140 kilometers (87 mi) northeast into Jordan,[1] ending in the wells of Maybuʿ.

[4] Wadi Sirhan was the home region from which the Salihids entered Syria and became the principal Arab federates of the Byzantine Empire throughout the 5th century CE.

[3] The Ghassanids were charged by the Byzantines with supervision over the region after Emperor Justinian I dismantled the Limes Arabicus, a series of garrisoned fortifications guarding the empire's eastern desert frontiers, c. 530.

[5] The lowland gained its current name following the migration of the Sirhan tribe, purported descendants of the Banu Kalb, to the Dumat al-Jandal region from the Hauran c. 1650.

[7] T. E. Lawrence referred to the Wadi, during the Arab Revolt, "We found the Sirhan not a valley, but a long fault draining the country on each side of it and collecting the waters into the successive depressions of its bed.