The largest mirror in the world: the Bolivia Salt Flats

A Salt Desert Land

In the middle of southwest Bolivia sits a vast, 4,000 square measure patch of salt flats. in the summer, it is a prime supply of metallic element and salt, however throughout the flooding season, it transforms into one thing very incredible: the world's largest mirror.

the largest mirror in the world: the Bolivia Salt Flats

From Wikipedia:

Salt flats are ideal for calibrating the distance measurement equipment of satellites because they are large, stable surfaces with strong reflection, similar to that of ice sheets. As the largest salt flat on Earth, Salar de Uyuni is especially suitable for this purpose. In the low-rain period from April to November, due to the absence of industry and its high elevation, the skies above Salar de Uyuni are very clear, and the air is dry. It has a stable surface which is smoothed by seasonal flooding (water dissolves the salt surface and thus keeps it levelled). As a result, the variation in the surface elevation over the 10,582-square-kilometer (4,086 sq mi) area of Salar de Uyuni is less than 1 meter (3 ft 3 in), and there are few square kilometres on Earth that are as flat. The surface reflectivity (albedo) for ultraviolet light is relatively high at 0.69 and shows variations of only a few percents during the daytime. The combination of all these features makes Salar de Uyuni about five times better for satellite calibration than the surface of an ocean. Using Salar de Uyuni as the target, ICESat has already achieved the short-term elevation measurement accuracy of below 2 centimetres.