 It is 80 meters high and it is composed of 5-million-year-old sands.Sossusvlei is about 66 km past the Sesriem gate.The last 6 km can only be traversed with 4WD vehicles as the metalled road ends and sand begins (the place where the metalled road ends is known as "2x4 parking" as any non-4WD vehicle must stop there).