Namibia's Coastal Desert is one of the oldest deserts in the world. Its sand dunes, created by the strong onshore winds, are the highest in the world. Because of the location of the shoreline, at the point where the Atlantic's cold water reaches Africa's hot climate, often extremely dense fog forms along the coast. Near the coast there are areas where the dune-hummocks are vegetated. Namibia has rich coastal and marine resources that remain largely unexplored.