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Salar de Uyuni is the world's largest natural mirror, and a candidate for a New Wonder of the World.
Located in southwest Bolivia, the world's largest salt flat contains 10 billion tons of salt across over 4000 square miles of span. It is 25 times larger than the Bonneville salt flats in Utah.
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In the winter season, the planes are covered with a thin sheet of water. Coupled with the clear, dry air and incredibly flat surface, this creates a natural mirror that boggles the mind in clarity and magnificence.
Satellite Calibration
Because of its mammoth size, arid air, and incredibly smooth surface, the flat can act as an incredibly perfect natural mirror, used for calibrating remote sensing instruments on orbiting satellites (such as Europe's GPS service). When used for that purpose, Salar de Uyuni works nearly 5 times better than the surface of the ocean.
Harvesting Salt
Salt is collected using traditional methods-- workers scrape the salt into small mounds, which helps the water evaporate. The salt is then fully dried over fire, and enriched with iodine.
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Sources: Wikipedia, Flickr, Encyclopedia Britannica
http://www.flickr.com/photos/zaturno/2322246805/ under CC license
