🇮🇷 Iran · Hydraulic works
Kebar Dam — Oldest Surviving Arch Dam (Mongol)
Ilkhanid Mongol (1300) to Safavid · Mongol–Persian hydraulic (Rashid al-Din's Jami' al-Tawarikh?), Qom Shi'a
1300 Mongol 26-m arch radius 35 m, oldest surviving arch dam (first Mongol), 294 yr before Tibi Europe.