Salar de Uyuni, Bolivia’s mirror-flat salt horizon
Published on 09/19/2026 at 19:09 | Editorial responsibility: Rafael MĂĽller, Editor-in-Chief AD HOC NEWS
On the Andean plateau of southwest Bolivia, Salar de Uyuni spreads as a vast high-altitude salt flat where a pale crust seems to merge with the sky. Sitting on the Altiplano near the town of Uyuni in the Potosà Department, it forms an almost level expanse of salt at around 3,656 m (11,995 ft) above sea level that has become one of the country’s defining landscapes.
A salt flat on the Bolivian Altiplano
Salar de Uyuni lies in southwestern Bolivia within the Daniel Campos Province of the Potosà Department, near the crest of the Andes on the Bolivian Altiplano.Situated in southwestern Bolivia The flat is widely recorded with a surface area of about 10,582 km² (around 4,086 sq mi), making it the largest continuous salt flat on Earth by area.Area of about 10,582 km² Its altitude places it among the high plateaux of the central Andes, part of the broader Altiplano that extends across Bolivia into neighbouring countries.Located within the Altiplano
The salt crust covering Salar de Uyuni forms a remarkably even surface that has been measured with less than one metre of vertical relief over thousands of square kilometres.Less than one metre of relief This flatness has helped make the salt pan a transport route across the Altiplano’s interior, with tracks crossing the white surface towards distant villages and isolated hills.A major transport route Around its margins, low hills and volcanic remnants rise from the plateau, offering vantage points over the patterned crust and the surrounding high-altitude landscape.Low hills around the margins
From prehistoric lake to salt crust and brine
The expanse now known as Salar de Uyuni began as part of a system of large lakes occupying the Bolivian Altiplano during the Late Pleistocene, fed by Andean rivers and enclosed by surrounding ranges.Transformations of Late Pleistocene lakes As the climate changed and these inland waters evaporated, dissolved minerals concentrated and eventually crystallised out, leaving behind extensive deposits of halite and other evaporite minerals that now form the salt pan.Salt-encrusted waste area The basin’s sediments retain a record of fluctuating water levels, providing a valuable archive for reconstructing past conditions on the Altiplano.Sediments record fluctuations
The salt crust at Salar de Uyuni is several metres thick in places and lies above a pool of brine rich in dissolved minerals, including large quantities of lithium.Crust above brine rich in lithium Estimates of lithium resources beneath the salt flat reach into the millions of tonnes, marking the site as a major reservoir of this light metal that is used in batteries and other technologies.Major lithium reservoir At the surface, the salt crust dries and cracks into plate-like patterns, forming an extensive mosaic of polygons that extend in every direction across the flat.Plate-like patterns across the surface
A mirror horizon and islands in the salt
Under certain conditions, a shallow sheet of rainwater spreads across Salar de Uyuni, turning the flat into a reflective surface that can create the impression of walking between twin skies.Thin water layer creating reflection This mirror-like effect has become closely associated with images of the Uyuni salt flat, though the underlying crust remains a consistent feature, built of interlocking salt plates rising slightly along their edges.Geometric salt crust and reflections When the surface is dry, the patterns stand out as pale hexagonal or polygonal fields stretching towards distant volcanoes and islands.
Across the interior of Salar de Uyuni, several rocky islands rise from the salt crust, remnants of former shorelines where higher ground once stood above lake waters.Rocky islands in the salar One of the most visited is Incahuasi, an island where cacti grow across the slopes and vantage points give wide views back over the white expanse.Incahuasi Island with cacti From such elevated ground, the salt flat can appear as an unbroken sheet, framed by distant ridges and volcanic summits around the horizon.
Visiting Salar de Uyuni: what travellers from Western Europe should know
- Salar de Uyuni lies in southwest Bolivia on the Altiplano, with access routes converging on the town of Uyuni in the PotosĂ Department.
- The salt flat sits at around 3,656 m (11,995 ft) above sea level, so visitors experience high-altitude conditions on a largely exposed plateau.
- The crust forms an extensive, open surface where travel involves crossing wide areas without natural shade, with occasional rocky islands offering elevated viewpoints.
- The official language is Spanish and the currency is the Boliviano.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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Frequently asked questions about Salar de Uyuni
Where is Salar de Uyuni?
It is in southwest Bolivia on the Andean Altiplano, in the PotosĂ Department near the town of Uyuni at around 3,656 m (11,995 ft) above sea level.
What should visitors expect on a visit?
Visitors encounter a vast, pale salt crust stretching towards distant volcanic hills, with high-altitude conditions and occasional rocky islands rising from the flat.
What makes Salar de Uyuni distinctive?
Its combination of extreme flatness, extensive patterned salt crust, high-altitude setting and mirror-like reflections after rainfall distinguishes the Uyuni salt flat among landscapes in the central Andes.
