Grand Erg Occidental Grand Erg Occidental The Grand Erg Occidental (, al-ʿIrq al-Gharbī al-Kabīr), (also known as the Western Sand Sea) is the second largest erg in northern Algeria after the Grand Erg Oriental. It covers an area of approximately . The sand dunes in the erg are formed by the wind, and can be up to high. Certain crescent-shaped dunes, known as barchans, are actually mobile; the wind can push these dunes as much as 20 to 30 m (65-100 ft) in one year. It is a desert natural region that receives less than 50 mm (1,96 in) of rainfall per year.
Erg Ferradj are generally well provided for. 100% of Erg Ferradj's population is connected to drinking water, 99% is connected to the sewerage system, and 99% (including 756 buildings) have access to electricity. There is no fuel service station in the town. Erg Ferradj has a total of 1,300 houses, of which 712 are occupied, giving an occupation rate of 6.2 inhabitants per occupied building. Erg Ferradj is reached by a local road from the N6 highway just west of Abadla. It is from Abadla and from Béchar. There is a total length of of roads in the commune. There are 3