July 22, 2013
Incahuasi Island, Bolivia
Photograph by George Steinmetz, National Geographic
Moonlight bathes Incahuasi Island, an outcropping of cacti and fossilized algae in the Salar de Uyuni salt flat. A great lake covered this area 16,000 years ago. When it dried up, it left a 4,000-square-mile basin of salt, the world's largest such deposit.
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