An curved arrow pointing right. At a staggering 4,086 square miles, Bolivia's Salar de Uyuni is the biggest salt flat in the world. During the rainy season, it essentially turns into a giant mirror.

Over the past 40 years, the Bolivian Altiplano region, where Salar de Uyuni is located, has experienced declining rainfall during the pre-rainy season, from September to November. Now, climate ...