Moonlight illuminates the cacti of Isla Incahuasi after summer rains have flooded the Salar de Uyuni to a depth of 7 inches. The island is famous for its forest of "cactus corales temperatura", an endemic specie that favors volcanic soil overlain with fossilized algae. The algae flourished at a time when the Salar de Uyuni was covered in 300-600 ft. of water. The cacti grow on average only 0.5 inch/year, and some are over 40 ft. high. The Salar is the largest salt flat in the world, covering over 3,800 sq. mi., at an elevation of 12,000 ft..
