Salar de Uyuni’s vast white horizon near Uyuni
Published on 09/14/2026 at 10:05 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Salar de Uyuni west of Uyuni in Bolivia is a vast high-altitude salt flat where a hard white crust and seasonal water turn the Andean plateau into an otherworldly horizontal landscape. Set on the Altiplano in the Potosí Department and Daniel Campos Province, it spreads across thousands of square kilometres at around 3,656 m (11,995 ft) above sea level.
A salt crust that becomes a mirror
The defining experience of Salar de Uyuni is the way its salt crust dominates the horizon, forming an almost level surface that extends as far as the eye can see. Geologists describe it as a wide salt pan or playa made primarily of porous halite, the mineral form of sodium chloride, sitting on the central trough of the Bolivian Altiplano.porous halite filled with brine The crust is not uniform in thickness; studies report values from a few metres near the margins to greater depths towards the centre of the basin.halite-rich salt crust ranges in thickness
Across much of Salar de Uyuni the salt surface rises and falls only slightly, creating a remarkably flat plateau used as a reference surface for instruments that measure altitude from orbit.salt crust covering 10,000 square kilometers When rainwater collects in shallow sheets, the combination of water and white salt produces an extensive reflective surface that can turn sky and ground into a continuous image. During drier periods, the crust hardens into a pale, patterned plain with polygonal outlines traced by ridges of crystallised salt.
Altitude, scale and geology on the Bolivian Altiplano
Salar de Uyuni lies in southwestern Bolivia within the Daniel Campos Province of the Potosí Department, near the crest of the Andes and part of the wider Altiplano plateau.southwestern Bolivia within the Daniel Campos Province The salt flat itself sits at roughly 3,656 m (11,995 ft), with surrounding ground rising towards volcanic formations and other high-altitude salars such as Coipasa.elevation of 3,656 meters This combination of elevation and exposure creates an environment where sunlight, temperature and wind have strong effects on the appearance of the crust and the clarity of the air.
The scale of Salar de Uyuni is central to its character. Encyclopaedic sources and geological studies describe an area of around 10,000 to 10,582 square kilometres (3,900 to 4,086 sq mi), making it the largest recognised salt flat on Earth.about 4,085 square miles [10,582 square km] The present salt pan formed after large lakes on the Altiplano, including a body known as Lago Minchin in late Pleistocene time, dried and left behind thick deposits of saline material in enclosed basins.residual from a former large lake, Lago Minchin Over geological periods, inflowing streams and groundwater continued to bring dissolved minerals into the basin, while evaporation concentrated them to create the current crust and underlying brines.
Salt, brine and lithium beneath the surface
Beneath the visible crust of Salar de Uyuni lies a body of brine that is chemically complex and of global interest. Researchers sampling this interstitial brine describe compositions rich in lithium, potassium, magnesium and boron, with concentrations among the highest recorded in salt lake environments.brine very rich in Li, K, Mg, B Lithium values measured in near-surface brines range broadly, with widespread samples in the tens to hundreds of parts per million and locally higher figures in specific zones of the salar.near-surface brines containing lithium
Estimates based on drill holes and chemical analysis place the lithium resources of Salar de Uyuni in the millions of tonnes, making the basin one of the major identified accumulations of this element in salt lake brines worldwide.contains reserves of about 7.0 Mio tonnes of lithium The distribution of lithium and other dissolved salts reflects both the history of ancient lakes in the region and the contribution of volcanic rocks and ignimbrites in the surrounding catchment, which release these elements into water that eventually reaches the salar.leaching of lithium from ignimbrites The presence of extensive pore brine beneath a hard crust is part of what makes a visit here feel as though a thin surface separates the visible landscape from a hidden chemical world.
Visiting Salar de Uyuni: what travellers from Western Europe should know
- Salar de Uyuni lies in southwestern Bolivia on the Altiplano, west of the town of Uyuni, and is reached by road and organised vehicle tours from the region.
- The salt flat is an exposed high plateau at about 3,656 m (11,995 ft); the ground surface is hard underfoot in dry periods but can be covered by shallow water after rain.
- In the wider area of Salar de Uyuni, the terrain includes higher ground with volcanic cones and other salars, and vehicle routes may cross stretches with uneven surfaces and soft mineral deposits.
- 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 located?
It is a large salt flat in southwestern Bolivia on the Altiplano, within the Daniel Campos Province of the Potosí Department, west of the town of Uyuni.
What can visitors expect on a visit to Salar de Uyuni?
Visitors encounter an extensive pale salt crust at high altitude, sometimes covered by shallow water, with long horizons, strong light and vehicle tracks crossing the surface.
What makes Salar de Uyuni distinctive among landscapes?
Its combination of great area, near-level surface, high elevation and salt-rich crust over lithium-bearing brines gives the flat a character that is specific to this Bolivian basin.
