Some photos of the Erg Chebbi sand dunes near Merzouga in southeast Morocco. The Erg Chebbi sand dunes are the only real Saharian dunes complex (an "erg") in Morocco. The sand dunes reach a maximum height of 150m and extend for 22km from north to south. The colour of the sand of the Erg Chebbi dunes is orange. The ripple and wave patterns found in the sand are created by the wind.