natgeotravel: Nap time. A Tuareg guide rests at the summit of Tin-Merzouga, the largest dune (or erg) in the Tadrart region of the Sahara desert in southern Algeria. Photograph by Evan Cole
natgeotravel: Nap time. A Tuareg guide rests at the summit of Tin-Merzouga, the largest dune (or erg) in the Tadrart region of the Sahara desert in southern Algeria. Photograph by Evan Cole