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Sand mixes with snow in the Oleshky Sands, a semi-arid desert of southern Ukraine. This 62-square-mile (161-square-kilometer) region contains sand dunes as tall as 16 feet (5 meters) and is the second-largest desert in Europe. The origin of Oleshky Sands is uncertain — one theory says it is a dried riverbed of the Dnieper River; another points to over-grazing by millions of sheep pastured in the area during the 18th and 19th centuries.

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