There is great debate as to whether the dunes are purely created by the sediments washed up from shore, or also from sediment from the Kalahari Desert.
Some geologists believe that a significant amount of the eastern Namib's sediment comes from the red dunes of the Kalahari.
This is possible by the winds blowing in a northeastern fashion during the winter, and consequently the highest dunes and their windward side faces the northeast.
Whatever the case may be, there is no denying the fact that the dunes are special.
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