Salar de Uyuni is the world’s largest salt pan, located in southwest of Bolivia, it was formed as a result of several prehistoric lakes reconstructing. The salt pan is 10,582 square kilometers, and is at an elevation of 12,000ft above mean sea level.
In Skaftafell, Iceland, during autumn each year, ice caves begin to form and last throughout winter, and are only safe to enter in winter as they are unsafe during other seasons and can collapse at any time. Tourists are able to walk through the cave through a 22ft entrance, as you get to the end, it comes to a squeeze and is no more than 4ft high.
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