Algeria
Islam is the predominant religion in Algeria, with its adherents, mostly Sunnis, accounting for 99% of the population according to a 2012 CIA World Factbook estimate, and 97.9% according to Pew Research in 2010. There are about 150,000 Ibadis in the M'zab Valley in the region of Ghardaia.
Ghardaïa
Ghardaïa is the traditional heart of the M'zab valley and home of the Ibadi religious sect in Algeria. As a religious Muslim sect, they do not subscribe to the doctrine of Sunnism and Shi'ism. They practice a different way of praying, worshipping of God, and designing mosques compared to Malikis, the majority of Algerians. The wastage of water, and more generally any gift of land, is considered a sin. The Ghardaïa Mosque, built in the 10th century, is of Moorish architecture style. Its tower, simple and elegant, includes a large portal at the top of the shaft, the design of which provides for ventilation flow.