Grand Erg Oriental

The Great Eastern Erg spreads across the northern Sahara in long chains of wind-shaped dunes. Between the sand ridges lie stretches of hard, gravelly ground known as gassi. Along the western side of the sand sea, the oases of the Oued Righ form a chain of palm groves in the dry country. The dunes extend far beyond them, their changing forms marking one of the great sandy expanses of the Sahara.