Thanks for your comments. It's indeed a very beautiful place, I'll post some more photo's.
It's in fact the Namib desert - see discription below. The Kalahari is not so arid.
"The Namib Naukluft Park is one of the largest national parks in Africa, covering much of the central Namib Desert and the Naukluft Mountains. It is home to some of the rarest and weirdest plant and animal species in the world, including the Welwitschia Mirabilis, large lichen fields and Hartmann's Mountain Zebra. The park's main attractions are Sossusvlei, Sandwich Harbour and the Naukluft hiking and four wheel drive trails."
Dead Vlei (45) *