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 Souss-Massa-Draa 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 with some dunes around 60m high, it is the largest and wildest of Morocco.
Because it is relatively difficult to access – it is only accessible by 4x4, camel or on foot – Erg Chigaga remains significantly less visited then Erg Chebbi. From Wikipedia