Sand dunes in the Western Great Erg near the small oasis town of Taghit on the - only in winter and spring water-bearing - Oued Zousfana. - Whirlwind on the sand dune. - Algeria - 1971

Sand dunes in the Western Great Erg near the small oasis town of Taghit on the - only in winter and spring water-bearing - Oued Zousfana. - Note the swirl of sand above the dune. - Algeria - 1971

Wind vortex in the Enneri Bardague. In the background the siluette of Pic Toussidé - Tibesti - Chad - 1967

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