Erg Chebbi offer camel trips into the dunes, taking tourists on overnight trips to permanent campsites several kilometres into the erg, and out of sight of the hotels. Erg Chebbi's proximity to the tourist center has led to the erg sometimes being referred to as "dunes of Merzouga." During the warmest part of the year, Moroccans come to Erg Chebbi to be buried neck-deep in the hot sand for a few minutes at a time. This is considered to be a treatment for rheumatism. Erg Chebbi Erg Chebbi () is one of Morocco's several ergs – large seas of dunes formed by
Grand Erg Oriental of the Sahara is probably As-Sahra al-Libiyah, which straddles the inland border of Libya and Egypt. Erg is a Tamachek Berber word, and also a geographic term of art. The Grand Erg Oriental used to be associated with the Wadi Igharghar, a mostly dry and buried river with a sizable network of tributaries which, should it possess any water, would flow north into the erg from the Ahaggar mountains of the central Sahara. Yet such dry, anciently-made river beds, lying seemingly useless beneath the desert sands, can preserve the infrequent rain water, by carrying it off underground and so rescue