Analysis of information sources in references of the Wikipedia article "Salar de Uyuni" in English language version.
Sudden rains leave a layer of dead calm water just an inch deep, turning the salt flat into a natural wonder: the world's largest mirror, eighty miles across. At night, the landscape is transformed again into a 360-degree starscape. This dazzling show is only possible because the Salar de Uyuni is perfectly flat.