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Standing on the deserted streets of Uyuni, a dusty, windswept pueblo in remotest Bolivia, it's hard to imagine that a little under 15km away lies one of the world's most incredible natural phenomenons. A short, bumpy jeep ride to the west is the edge of the Salar de Uyuni, a vast expanse of salt flats that covers over 10,000 square kilometers of the country's southwestern corner like a giant coat of whitewash.

Bolivia lays claim to some of South America's finest natural attractions - the Amazon, the Pantanal and Lake Titikaka all lie within its borders - but for sheer stop-you-in-your-tracks surrealism, the Salar de Uyuni is in a class of its own. The clarity of the altiplano sky is startling, the juxtaposition between blazing blue and sparkling white remarkable, and it feels like you're in an expensive car advert as you roll silently across the crystals, with only the Isla del Pescado, a cacti-studded island in a sea of salt, breaking the bleached horizon.

The salar's origins vary depending on who you ask: geologists will tell you it was formed either by the drying up of an enormous lake into which salt had been washed from surrounding land, deposited when what is now Bolivia was under the ocean; locals will have you believe it came into being when Yana Pollera, the mountain goddess, flooded the southwestern plains with her milk so that her child, Kaliktan, could feed - the milk eventually turning into salt. It's hard not to wonder if the locals aren't onto something, such is the bizarreness of it all. Stepping from the jeep, the ground crunching underfoot as if it were hard-packed snow, it's just salt, salt and more salt as far as the eye can see, like a million diamonds twinkling in the southern sun.

Need to know

The only way to visit the Salar de Uyuni is on an organized tour from Uyuni, a twelve-hour bus ride from La Paz. Tours are by 4WD and last three or four days, taking in the salt flats, as well as the Reserva de Fauna Andina Eduardo Avaroa, a wildlife reserve of glacial green and red lakes on the border with Chile.