The Grand Western Erg a veritable sea of sand of 80,000 km2, is the desert as one might imagine, immense and almost inhuman in beauty. Bordered by the M’zab to the east, the Saoura valley to the west, it acts as an impassable barrier between the Saharan Atlas and the Tadmaït plateau to the south. This alluvial sand (not transported by the wind) would have started to accumulate in the Quaternary, to become today these immense changing dunes …
