color, indicative of the high concentration of iron in the sand and the resulting oxidation processes. The oldest mounds are
of a more intense red colour. These dunes are the tallest in the world; Many of them are above 200 m, the highest one
pans appear almost white in color due to the high concentration of salt. Another relevant source of water for
Sossusvlei is humidity brought on by daily morning fog that enters the desert from the Atlantic Ocean.