The Uyuni Salt Flats or Salar de Uyuni are located in southwest Bolivia. They are the largest salt flats in the world and cover an area of 4,086 square miles. They we formed fr the transfo of sev prehistoric la. Apart fr containing enor quantities o salt, t flats a home t between fifty a seventy p cent o the wor known lit reserves, a chem element wh is us to ma batteries. T flats att thousands o tourists ev year a visitors can even sleep in a hotel constructed entirely from salt. The best time to visit the flats is between April and November, when it doesn’t rain very much.