Pete Oxford / Car crossing Uyuni, largest salt pan in world, south west Bolivia, South America

Pete Oxford / Polygon formations on surface of Uyuni Salt Pan, South western Bolivia, South America

Robert Fulton / Aerial view of mountains near Salar de Uyuni, Bolivia

Robert Fulton / Aerial view of mountains near Salar de Uyuni, Bolivia

John Shaw / Salt cones on the Salar de Uyuni, Bolivia., March. The Salar is the world's largest salt flat, at over 10500 square kilometres. Salt is shoveled into these cones, to be collected later. March 2012...

Jeff Vanuga / Tourists visiting the Salar de Uyuni salt flat, Atacama Desert, Altiplano / Andean Plateau, Daniel Campos Province, Bolivia. March 2017.

Jeff Vanuga / Salar de Uyuni salt flat, Atacama Desert, Altiplano / Andean Plateau. Daniel Campos Province, Bolivia. March 2017.

Jeff Vanuga / Salar de Uyuni salt flat, Atacama Desert, Altiplano / Andean Plateau. Potosi, Bolivia. March 2017.

Jeff Vanuga / Salar de Uyuni salt flat, Atacama Desert, Altiplano / Andean Plateau. Daniel Campos Province, Potosi, Bolivia. March 2017.

Shane P. White / Salt flat, Salar de Uyuni, Bolivia

Bernard Castelein / Salt pan, Salar de Uyuni at sunrise, Altiplano, Bolivia, April.

Bernard Castelein / Salt pan, Salar de Uyuni at sunrise, Altiplano, Bolivia, April.

Bernard Castelein / Vicuna (Vicugna vicugna) Uyuni, Altiplano, Bolivia

Mark Taylor / Tunupa Volcano, Uyuni, Bolivia. December 2016.

Mark Taylor / Pasacana Tree Cacti (Echinopsis atacamensis), Salar de Uyuni, Bolivia. December 2016.

Mark Taylor / Salt formations on surface of Salar de Uyuni Salt Pan. Bolivia. December 2016.

Mark Taylor / Salt formations on surface of Salar de Uyuni Salt Pan. Bolivia, December.

Mark Taylor / Salt crystals on surface of Salar de Uyuni Salt Pan. Bolivia. December 2016.

Bernard Castelein / Salar de Uyuni salt flat just before sunrise, Altiplano, Bolivia

Bernard Castelein / Volcano Tunupa, Salar de Uyuni salt flat just after sunset, Altiplano, Bolivia

Bernard Castelein / Salar de Uyuni salt flat at sunset, Altiplano, Bolivia

Bernard Castelein / Salar de Uyuni salt flat at sunset, Altiplano, Bolivia

Bernard Castelein / Salar de Uyuni salt flat just after sunset, Altiplano, Bolivia

Bernard Castelein / Salar de Uyuni salt flat just after sunset, Altiplano, Bolivia

Bernard Castelein / Salar de Uyuni salt flat just after sunset, Altiplano, Bolivia

Bernard Castelein / Isla / Island Incahuasi with cacti in the Salar de Uyuni salt flat, Altiplano, Bolivia

Bernard Castelein / Isla / Island Incahuasi with cactus in the Salar de Uyuni salt flats, Altiplano, Bolivia

Bernard Castelein / Southern Viscacha (Lagidium viscacia) at rest, Isla Incahuasi in the Salar de Uyuni, altiplano, Bolivia

Bernard Castelein / Andean flicker (Colaptes rupicola) Salar de Uyuni, altiplano, Bolivia September

Bernard Castelein / Andean goose (Chloephaga melanoptera) flying across lagoon, Salar de Uyuni, altiplano September

Bernard Castelein / Andean goose (Chloephaga melanoptera) and Puna ibis (Plegadis ridgwayi) standing in lagoon, Salar de Uyuni, altiplano, Bolivia, September

Bernard Castelein / Puna / James flamingo (Phoenicoparrus jamesi) walking profile, Salar de Uyuni, altiplano, Bolivia September

Bernard Castelein / Puna / James flamingo (Phoenicoparrus jamesi) walking profile, Salar de Uyuni, altiplano, Bolivia September

Bernard Castelein / Puna / James flamingo (Phoenicoparrus jamesi) feeding in mud, Salar de Uyuni, altiplano, Bolivia September

Bernard Castelein / Puna / James flamingo (Phoenicoparrus jamesi) feeding in mud, Salar de Uyuni, altiplano, Bolivia September

Bernard Castelein / Salar de Uyuni salt flat at sunrise, Altiplano, Bolivia

Merryn Thomas / Cactus on the coast of Fish Island, Salar de Uyuni salt flats, Atacama Desert, Bolivia. December 2013.

Merryn Thomas / Harvesting salt on Salar de Uyuni salt flats, Atacama Desert, Bolivia. December 2013.

Merryn Thomas / Man in vehicle, photographing Salar de Uyuni salt flats, Atacama Desert, Bolivia. February 2014.

Rhonda Klevansky / Workers mining salt from Salar Uyuni, the worlds biggest salt pan. Bolivan Altiplano, Bolivia. February 2009.

Rhonda Klevansky / Workers mining salt from Salar Uyuni, the worlds biggest salt pan. Bolivan Altiplano, Bolivia. February 2009.

Rhonda Klevansky / Workers mining salt from Salar Uyuni, the worlds biggest salt pan. Bolivan Altiplano, Bolivia. February 2009.

Rhonda Klevansky / Workers mining salt from Salar Uyuni, the worlds biggest salt pan. Bolivan Altiplano, Bolivia. February 2009.

Rhonda Klevansky / Mounds of salt, mined from the salt pans of Salar Uyuni, the worlds biggest salt pan, Bolivan Altiplano, Bolivia. February 2009.

Rhonda Klevansky / Hole in the salt pan of Salar de Uyuni, the worlds biggest salt pan, Bolivian Altiplano, Bolivia. February 2009.

Rhonda Klevansky / Salar de Uyuni, the worlds biggest salt pan, from hills above, Bolivian Altiplano, Bolivia. February 2009.

Rhonda Klevansky / Tourist standing by hole in Salar de Uyuni, the worlds largest salt pan, Altiplano, Bolivia. February 2009.

David Noton / Patterns created by dried salt on the earth's surface, salt flats of Salar de Uyuni, Bolivia, December 2009

David Noton / Patterns created by dried salt on the earth's surface, salt flats of Salar de Uyuni, Bolivia, December 2009

David Noton / llama on the edge of the Salar de Uyuni at dawn, Bolivia

Grant Dixon / Hexagonal crystallization fissures in 100 kilometer wide, 500 kilometers thick and 12,000 year old Salar de Uyuni salt pan, altiplano, Potosi District, Bolivia

Grant Dixon / Hexagonal crystallization fissures in 100 kilometer wide, 500 kilometers thick and 12,000 year old Salar de Uyuni salt pan, altiplano, Potosi District, Bolivia

Grant Dixon / Cacti on Isla de Pescadores with salt pan in the background, Salar de Uyuni, Bolivia

Pete Oxford / Common mountain viscacha (Lagidum viscacia) on rocks, Inkawasi Island, Salar de Uyuni, Bolivia

Matthew Maran / Rock Formation, Salar de Uyuni (salt flats), Altiplano, Bolivia

Matthew Maran / Cactus Island, Salar de Uyuni (salt flats) circuit, Altiplano, Bolivia

Doug Allan / Doug Allan, cameraman, filming for BBC 'Andes to Amazon' on the saltflats of Salar de Uyuni, Bolivia, 1997

Pete Oxford / Mummy in cave on hillside of Tupisa / Tupiza volcano, Uyuni NP, altiplano, Bolivia

Pete Oxford / Aymara couple living on Inkawasi Island, Uyuni Salt Pan, SW Bolivia, South America

Doug Allan / Aerial view of saltflats of Salar de Uyuni at 3800m, Bolivia, South America

Pete Oxford / Formation of polygons on surface of Uyuni salt pan, South West Bolivia, South America

Pete Oxford / Whole family of preserved mummies in cave on hillside of Tupisa / Tupiza volcano, Uyuni NP, altiplano, Bolivia

Pete Oxford / Wall constructed from salt bricks, Salt hotel, Uyuni salt pan, Altiplano, Bolivia

RHONDA KLEVANSKY / Cacti on Inkawasi Island, Salar de Uyuni, Uyuni salt flats, Bolivia, South America

Pete Oxford / Interior of Salt hotel with furniture made of salt, Uyuni salt pan, altiplano, Bolivia

Robert Fulton / Aerial view of Salar de Uyuni over salt lake, Bolivia, South America 2000

Robert Fulton / Aerial view of Salar de Uyuni over salt lake, Bolivia, South America 2000

Pete Oxford / Salt miner digging up salt into wheelbarrow, Uyuni salt pan, Altiplano, Bolivia

Doug Allan / Cacti on Isla de Pescadores, isolated barren island in saltflats of Salar de Uyuni, altiplano at 4000m, Bolivia.

Robert Fulton / Aerial view of Salar de Uyuni over salt lake, Bolivia, South America 2000

RHONDA KLEVANSKY / Common mountain viscacha {Lagidium viscacia} Inkawasi Is Salar de Uyuni, Bolivia

Pete Oxford / Common mountain viscacha {Lagidium viscacia} Inkawasi island, Salar de Uyuni, SW Bolivia

Tui De Roy / Island in the middle of 100 kilometer wide Salar de Uyuni salt pan showing hexagonal crystallization fissures, Bolivian altiplano, Potosi District, Bolivia

Tui De Roy / Island in the middle of 100 kilometer wide Salar de Uyuni salt pan showing hexagonal crystallization fissures, Bolivian altiplano, Potosi District, Bolivia

Tui De Roy / Hexagonal crystallization fissures in 100 kilometer wide, 500 kilometers thick and 12,000 year old Salar de Uyuni salt pan, altiplano, Potosi District, Bolivia

Tui De Roy / Hexagonal crystallization fissures in 100 kilometer wide, 500 kilometers thick and 12,000 year old Salar de Uyuni salt pan, altiplano, Potosi District, Bolivia

Tui De Roy / Hexagonal crystallization fissures in 100 kilometer wide, 500 kilometers thick and 12,000 year old Salar de Uyuni salt pan, altiplano, Potosi District, Bolivia

Tui De Roy / Hexagonal crystallization fissures in 100 kilometer wide, 500 kilometers thick and 12,000 year old Salar de Uyuni salt pan, Potosi District, Bolivia

Tui De Roy / Hexagonal crystallization fissures in 100 kilometer wide, 500 kilometers thick and 12,000 year old Salar de Uyuni salt pan, altiplano, Potosi District, Bolivia

Robert Fulton / Aerial view of Salar de Uyuni salt flat sand bars and lakes, Bolivia, with flamingoes

RHONDA KLEVANSKY / Salar de Uyuni, Uyuni salt flats with polygon formations. Desert, Bolivia, South America

Shane P. White / Cactus (Echinopsis atacamensis) group and salt flat, Salar de Uyuni, Bolivia

Shane P. White / Dried salt, Salt flat, Salar de Uyuni, Bolivia

Shane P. White / Cactus (Echinopsis atacamensis) group and salt flat, Salar de Uyuni, Bolivia

Shane P. White / Salt flat, Salar de Uyuni, Bolivia

Shane P. White / Car race monument in salt flat, Salar de Uyuni, Bolivia

Pete Oxford / Common mountain viscacha {Lagidium viscacia} Inkawasi island, Salar de Uyuni, SW Bolivia

Tui De Roy / Hexagonal crystallization fissures in 100 kilometer wide, 500 kilometers thick and 12,000 year old Salar de Uyuni salt pan, altiplano, Potosi District, Bolivia

Doug Allan / Aerial view of saltflats Salar de Uyuni Bolivia 3800m

RHONDA KLEVANSKY / Salar de Uyuni Uyuni salt flats Bolivia

Pete Oxford / Polygon formations on surface of Uyuni Salt Pan Bolivia

Pete Oxford / Common mountain viscacha {Lagidium viscacia} Salar de Uyuni, Bolivia, South America

Doug Allan / Photographer Doug Allan sits outside a Hotel made of salt, salt flats, Salar de Uyuni, Bolivia.

Doug Allan / Salar de Uyuni salt flats, the largest and highest salt flats in the world, Bolvia.

Theo Allofs / Trichocereus Poco (Echinopsis tarijensis) cacti in desert at night, Salar de Uyuni, Bolivia