Salar de Uyuni, the vast white horizon of southwest Bolivia
Published on 09/21/2026 at 18:14 | Editorial responsibility: Rafael MĂĽller, Editor-in-Chief AD HOC NEWS
On the Andean Altiplano of southwest Bolivia lies Salar de Uyuni, a salt flat whose white surface stretches so far that earth and sky seem to meet in one continuous horizon. Sitting at around 3,656 m (11,995 ft) above sea level in the PotosĂ Department near Uyuni, it forms a high plateau where a hard salt crust replaces the usual mountain rock and grassland.
A salt crust on an ancient lake bed
Salar de Uyuni occupies part of the Bolivian Altiplano, a broad high plateau between the ranges of the Andes, in a basin that once held large prehistoric lakes. The flat’s present surface covers about 10,582 km², forming an almost continuous sheet of salt across the Daniel Campos Province and neighbouring areas of PotosĂ.covers about 10,582 square kilometres The ground beneath the crust holds extensive deposits of halite and brine, with studies describing salt layers packed in sequences above older sediments.salt extends to depths of up to 120 m
Geological work links the formation of Salar de Uyuni to Quaternary lake phases on the Altiplano, including periods when lakes such as Minchin and Tauca spread across what are now several salars and smaller water bodies.major minerals found in the salar are halite and gypsum As these lakes evaporated, dissolved minerals crystallised and accumulated in thick layers, leaving a hardened surface that now appears as a pale, almost uniform plain. The result is an environment where the line between land and sky is marked mainly by distant volcanic hills and low islands rising from the white floor.
Geometry, flatness and the white horizon
The uppermost layer of Salar de Uyuni is a crust of salt strong enough to support vehicles across wide areas, forming polygonal patterns where the salt has dried and cracked into geometric plates.a thick, hard crust of salt Over much of the flat the altitude varies very little, making it one of the flattest natural surfaces recorded, with measurements showing less than a metre of vertical relief over thousands of square kilometres.less than 1 m of vertical relief over an area of 9,000 km² This remarkable evenness has led space agencies to use the area for calibrating satellite altimeters, treating the salar almost as a natural reference plane.
Across the surface, shallow seasonal water can transform the white crust into an immense mirror, when a thin film sits above the salt and reflects the sky. On dry days the visual character shifts: the salar becomes an expanse of pale, matte ground whose polygonal structure is easy to see underfoot, broken only by low islands such as Incahuasi, where dark rock and tall cacti rise above the surrounding whiteness.Incahuasi Island hosts giant cacti The contrast between the salt and these outcrops gives travellers oriented points in a landscape that otherwise reads as a near-featureless plane.
Lithium, salt extraction and local settlements
Beneath the crust of Salar de Uyuni sit substantial reserves of brine rich in lithium and other minerals, making the region a focus for discussion of resource extraction and industrial development. Various sources describe the salar as containing a very large share of known lithium reserves worldwide within its subsurface brine.home to a high proportion of the world’s lithium reserves Bolivian state bodies oversee exploration and regulation of lithium projects in the area, reflecting the mineral’s growing importance for battery technology and electronics.Bolivian national agencies oversee lithium exploration
Salt extraction in and around the salar has a longer history, with local communities working the crust at its margins and operating small saltworks close to villages. Settlements such as Uyuni serve as gateways to the salt flat, providing rail and road connections across the high plateau.Uyuni Salt Flat lies on the Altiplano at 3,656 metres Around the edges of the flat, low hills and remnants of volcanic cones rise above the salt, framing views back toward the centre and underlining the salar’s scale against the Andean skyline.
Visiting Salar de Uyuni: what travellers from Western Europe should know
- Salar de Uyuni lies in southwest Bolivia on the Altiplano, with the town of Uyuni acting as a common access point by road and rail from other Bolivian cities.
- The salt flat sits at high altitude around 3,656 m (11,995 ft), and approaches across the salar involve travel over a hard salt surface rather than conventional paved roads or paths.
- In drier periods the ground underfoot consists of firm salt polygons; when shallow water covers the surface, vehicles and travellers move across a reflective film above the crust.
- 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?
Salar de Uyuni lies on the high Altiplano of southwest Bolivia, primarily in the Daniel Campos Province of PotosĂ, with the town of Uyuni nearby.
What should travellers expect on a visit to Salar de Uyuni?
Travellers encounter a vast salt surface with geometric patterns, high-altitude light and distant volcanic hills, and in some seasons a thin reflective layer of water above the crust.
What makes Salar de Uyuni distinctive among landscapes?
Its combination of scale, extreme flatness, thick salt crust and subsurface lithium-rich brine makes Salar de Uyuni stand out within Andean landscapes and among salt flats worldwide.
