Location: Summit of Tin-Merzouga, Tadrat, Tassili N'Ajjer National Park, Algeria
"This photo, of Moussa Macher, our Touareg guide, was taken at the summit of Tin-Merzouga, the largest dune (or erg) in the Tadrat region of the Sahara desert in southern Algeria. Moussa rested while waiting for us to finish our 45 minute struggle to the top. It only took 10 minutes of rolling, running, and jumping to get to get back down. The Tadrat is part of the Tassili N'Ajjer National Park World Heritage Area, famous for its red sand, and engravings and rock paintings of cattle, elephants, giraffes, and rhinos that lived there when the climate was milder."