Erg (landform) and western Asia, and Central Australia. In South America, ergs are limited by the Andes Mountains, but they do contain extremely large dunes in coastal Peru and northwestern Argentina. They are also found in several parts of the northeast coast of Brazil. The only active erg in North America is in the Gran Desierto de Altar () that extends from the Sonoran Desert in the northwestern Mexican state of Sonora to the Yuma Desert of Arizona and the Algodones Dunes of southeastern California. An erg that has been fixed by vegetation forms the Nebraska Sandhills (). Sand seas and dune
Erg Ferradj eastern side. Erg Ferradj has a hot desert climate, with extremely hot summers and cool winters, and very little precipitation throughout the year. Agriculture is the main industry in Erg Ferradj. The commune has a total of of arable land found mainly to the east of the town, of which is irrigated. There are a total of 116,040 date palms planted in the commune. As of 2009 there were 9,575 sheep, 6,050 goats, 714 camels, and 23 cattle. There were also 6,400 chickens in 6 buildings. There is no significant tourist industry in Erg Ferradj. Basic services in the town