Why is called the city of thousands of Dome and DomeThe architectural character of the city what made the city distinctive and dubbed the city millennium dome and the dome so that the roofs of houses built on a dome-shaped to prevent the sand above the pool, because of the frequent sand storms in the regionKnown as the city of the valley planting dates, high-quality and globalEl Oued Province lies in the Sahara desert in northeast Algeria. The mostly uninhabited southern half of the province is covered by the Grand Erg Oriental, a vast region of uninterrupted sand dunes. The northern half of the province is a mixture of sandy desert with scarce vegetation, scattered oases, and salt lakes. The most notable oases are the Oued Souf region, upon which the capital El Oued and neighbouring towns are built, as well as oases located near the towns of El M'Ghair and Djamaa, both of which support extensive palm plantations. Chott Melrhir, a large endorheic salt lake, lies in the north-central part of the province, while Chott Felrhir is a smaller salt lake that to its southwest, near El M'Ghair. These salt lakes, and the surrounding areas, lie as much as 30 metres (98 ft) below sea level; nearby towns and villages including Hamraia, Méguibra, Dendouga and Aïn Cheikh are also below sea level.