About Salar de Uyuni: Salar de Uyuni in Bolivia is the largest salt flat in the world. It covers over 10,000 sq km, left behind when an ancient lake dried up. After rain it turns into a giant mirror reflecting the sky. It holds an estimated 10 billion tonnes of salt

Location: High in the Andes of southwest Bolivia · Country: Bolivia · Type: A vast, flat plain of solid white salt · Record: The largest salt flat in the world · Big Number: It covers over 10,000 sq km (4,000 sq mi) · How It Formed: An ancient lake dried up, leaving thick layers of salt · Nature: After rain it becomes a giant mirror of the sky · World Rank: So huge and flat it can be seen from space