Ghardaïa is the capital city of Ghardaïa Province, Algeria. It is located in northern-central Algeria in the Sahara and lies along the left bank of the Wadi Mzab. The M'zab in the Ghardaïa Province was made a World Heritage Site in 1982. Ghardaïa is part of a pentapolis, a hilltop city amongst four others, built almost a thousand years ago in the M’Zab valley. It was founded by the Mozabites, an Ibadi sect of the Berber Muslims.

en.wikipedia.org/wiki/Ghardaïa