Sossusvlei is one of Namibia’s must-see spots. Some of the world’s highest sand dunes in the world’s oldest desert provide the spectacular setting for a visit. Deadvlei is a flat pan, about a kilometer across, that used to have water until it was cut off from the river by a sand dune, about 500 years ago. The trunks of trees, dead for 500 years, make for an eerie scene, surrounded by high dunes.