Dunes have regular and irregular forms.
The sand comes as a deposit of rivers into the ocean and than blown further inland. Dunes grow about 20 meters a year. Dunes in Walvis Bay have wooden sticks on top and sides of it to prevent the movement of it. Another measure taken is process of planting of special bush watered with sea water only which keeps a dune more stable. It is known fact that the Municipality of Walvis Bay spends approximately 1 million dollars a year to keep streets of the town sand free.