Erg (landform) Erg (landform) An erg (also sand sea or dune sea, or sand sheet if it lacks dunes) is a broad, flat area of desert covered with wind-swept sand with little or no vegetative cover. The term takes its name from the Arabic word "ʿarq" (), meaning "dune field". Strictly speaking, an erg is defined as a desert area that contains more than of aeolian or wind-blown sand and where sand covers more than 20% of the surface. Smaller areas are known as "dune fields". The largest hot desert in the world, the Sahara, covers and contains several ergs, such as
Erg Chigaga access – it is only accessible by 4x4, camel or on foot – Erg Chigaga remains significantly less visited then Erg Chebbi. Erg Chigaga Erg Chegaga (or Chigaga) is one of two major Saharan ergs of the Sahara in Morocco, the other being the Erg Chebbi near Merzouga. This dunes are located in the Drâa-Tafilalet area about 50 km west of the rural town of M'Hamid El Ghizlane, itself located about 98 km south of the town of Zagora. With a length of approximately 40 km to 15 km width, some dunes are around 60m high (significantly less than the