Qanat

Also spelled  kanat  (Arabic), Persian  karez , Berber Arabic  foggara  ancient type of water-supply system developed and still used in arid regions of the world. A qanat taps underground mountain water sources trapped in and beneath the upper reaches of alluvial fans and channels the water downhill through a series of tunnels, often several kilometres long, to the places where it is needed for irrigation and domestic use. The development