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🇸🇦 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
Late Pre-Islamic to Early Islamic · Nabataean–Himyarite to Umayyad
110-m two-phase dam (320 BCE–750 CE) on Wadi al-Khanaq — Khaibar oasis northern reservoir.
🇸🇦 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.