Namibia is the second-least densely populated country in the world is also one of the newest. At 55–80 million years, the Namib Desert is the oldest desert in the world. Just to give you an idea the Sahara is ‘only’ 2-3 million years old. These dunes are the tallest worldwide, in places rising above the desert floor more than 300 meters (almost 1000 feet). At 325 meters, Big Daddy may be the highest dune in the Sossusvlei area, however it is not the highest in the Namib Desert. This honour is given to Dune 7, which has been measured at 388m and has earned its name by being the 7th dune along the Tsauchab River. It takes a solid hour to climb, and people have skied down from it.