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2 places to sift through. Narrow by kind, country, period or how firmly each one is established — contested and pseudoarchaeological claims are labelled here, never hidden.
🇸🇾 Syria · Hydraulic works
Umayyad (Hisham ibn Abd al-Malik) · Umayyad steppe palace culture
Hayr Gharbi: 16-km Umayyad 727 CE limestone canal from Harbaka Dam to steppe palace 34.52N 38.12E.
🇸🇾 Syria · Hydraulic works
Byzantine to Umayyad (580–728 CE) Palmyra steppe · Byzantine–Umayyad steppe palace (Hisham)
East Harbaqa canal 8.2 km rock-cut 2.2×1.4 m with 12 evaporation covers 180 m to Hayr East hayr 2.8 km wall.