قنات — سیستم آبرسانی زیرزمینی باستانی ایران (میراث یونسکو)
The qanat (کاریز or قنات) is one of humanity's greatest engineering achievements — a horizontal underground channel that draws water from an upland aquifer and transports it by gravity across flat terrain to surface outlets. Invented in Iran around 1000 BC, the technology enabled Persian civilization to thrive in the arid Iranian plateau.
A qanat system begins with a vertical 'mother well' (madar chah) dug until it reaches the water table in a hillside. Horizontal tunnels then carry the water downslope by gravity, surfacing in the inhabited area miles away. A typical qanat might be 10-50 km long with vertical shafts every 20-70 meters for access and air circulation — an underground aqueduct without any pumping.
Iran has 37,000+ operational qanats supplying fresh water to desert cities for over 3,000 years. UNESCO inscribed the Persian Qanat on its World Heritage List in 2016. The technology spread along Persian trade routes to the Arab world, North Africa, Spain (as the 'acequia'), and as far as the Americas. Many qanats in Iran continue to supply water to this day.
A qanat is an ancient Persian underground horizontal water channel that brings groundwater from upland aquifers to surface outlets across flat terrain using gravity alone. Iran has 37,000+ operational qanats, some 3,000+ years old.
Persian qanat technology spread along trade routes to the Arab world, North Africa, Spain (where it became the 'acequia'), the Canary Islands, and even parts of the Americas via Spanish colonialism.