Khettara or Fogarra

An ancient sophisticated system for water harvesting in the desert, still in use today in many countries. It consists of a subterranean canal structure and a succession of vertical shafts along the length of the canal that may reach a total length of 2-10 and sometimes even 15 km!

Worldwide, the foggaras are known by many names such as the qanat or the kariz of Persia, the falaz of Arabia, and the madrjirat of Andalusia, Spain.