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CategoriesDams
Walls thrown across a valley to hold back a season's water.
🇸🇦 Saudi Arabia · Hydraulic works
Early Islamic Umayyad (740 CE) NW Arabia · Umayyad Khaybar–AlUla Harrat oasis (NW Arabia)
Southeast expansion gravity dam 158 m × 14.2 m basalt 800 m: clay-core 2.1 m + 3-tier buttress trapping 42,000 m³.
🇸🇦 Saudi Arabia · Hydraulic works
Najdi Emirate to First Saudi State · Najdi oasis (Diriyah Amirship)
Wadi Hanifah: 6 Najdi 15th-18th c. wadi dams at Diriyah UNESCO site, Riyadh 24.73N 46.57E.
🇸🇦 Saudi Arabia · Hydraulic works
Umayyad (with possible South Arabian precursor) · Umayyad Hejaz oasis
Wadi Fatima: 65-m rock-fill dam at Al Jumum 28 km west of Mecca, 8th c. Umayyad 32,000 m³.