January 5, 2013
Uyuni Salt Flat, Bolivia
Photograph by Heiko Meyer, laif/Redux
Earth and sky are indistinguishable on the Salar de Uyuni, a vast salt flat in southwest Bolivia. 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. It's also one of Earth's flattest places—relief varies by less than 16 inches.
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