This story appears in the November 2012 issue of National Geographic magazine. I got my first lesson in the physics of sand dunes in 1998 on an expedition into the Sahara. In order to take aerial ...

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Vast white sand dunes stretch endlessly, cradling countless turquoise lagoons that form after seasonal rains. This unique landscape, a rare desert oasis, offers a breathtaking combination of ...

Almost two miles long and reaching heights of up to 400 feet, the immense dune contains around 60,000,000 cubic meters of sand. The view from the summit affords spectacular views across azure ...