along the Atlantic Ocean coastline of central Namibia lay what is
known as 'The Long Wall"; a wall of sand that meets the Atlantic
head on. The dunes rise some 300 feet in height along the coast,
and will eventually climb to over 1000 feet as they move further
inland to form the tallest dunes on the Planet
massive dunes eventually blow into the Orange River, which then
flows back to the coast where they are deposited at the southern
end of the Country. There the Benguela Current from Antarctica washes
the sand north where it eventually collides with the currents that
work their way east across the Atlantic.
collision washes the sand ashore again, at the Long Wall.