Sergey Gorshkov / Sand dunes, Namib Desert, Namibia

Richard Du Toit / Gemsbok (Oryx gazella) running, Namib-Naukluft National Park, Namibia

Jim Brandenburg / Aerial view of Namib Desert sand dunes, Namibia

Jim Brandenburg / Aerial view of Namib Desert meeting Atlantic Ocean at the Skeleton Coast, Namibia

Jim Brandenburg / Landscape of sand dunes, Namib Desert, Namibia

Gerry Ellis / Star dune formations, Namib-Naukluft National Park, Namibia

Gerry Ellis / Aerial view of barchan dunes showing typical horns and downwind slip face, at approximately 32 degrees, Skeleton Coast National Park, Namibia

Gerry Ellis / Aerial view of star dune formations, Namib-Naukluft National Park, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) trio running on sand dune, Namib Desert, Namibia

Michael & Patricia Fogden / Aerial view of sand dunes along the Skeleton Coast, Walvis Bay, Namibia

Cyril Ruoso / Coastal desert sand dunes, Swakopmund, Namibia

Cyril Ruoso / Desert sand dunes, Swakopmund, Namibia