🇮🇷 Iran · Hydraulic works
Qanat of Ghasemabad
Sassanian 6th c. to Ilkhanid 1226 CE to present · Sassanian then Islamic Yazd hydraulic community
12th century high-discharge qanat (14 km, 320 shafts, 190 L/s) feeding Ghasemabad bagh and Yazd mills.
🇮🇷 Iran · Hydraulic works
Qanat-e Zarch – Longest Qanat in Iran
Achaemenid to present (2,500 years continuous) · Persian qanat engineers (Achaemenid, Sassanian, Safavid)
71-km Zarch qanat—longest gravity aquifer tunnel on Earth (500 BCE–Safavid).
🇮🇷 Iran · Hydraulic works
Qanat of Zarch, Yazd
Achaemenid to present ~700 BCE–present · Persian (Median/Achaemenid onward)
71 km 2,115-shaft Zarch qanat - world's longest - still feeding Yazd after 3,000 years.