Salar de Uyuni, Bolivia’s vast mirror of salt and sky
Published on 08/31/2026 at 21:04 | Editorial responsibility: Rafael MĂĽller, Editor-in-Chief AD HOC NEWS
Salar de Uyuni in southwest Bolivia is a vast high-altitude salt flat where a hard white crust of salt and horizonless skies create a landscape that seems to erase distance. Lying on the Andean Altiplano in the Potosà Department, it stretches over about 10,582 km² and sits at roughly 3,656 m (11,995 ft) above sea level, making it a striking combination of scale and elevation anchored in the Bolivian Andes.
A salt crust the size of a small country
Salar de Uyuni occupies a broad basin on the Altiplano plateau in southwestern Bolivia, within the Daniel Campos Province of Potosà near the crest of the Andes Mountains.Uyuni Salt Flat The salt flat covers about 10,582 km² (4,085 square miles), an area comparable to a small country or a large island state.area of approximately 10,582 square kilometres Its surface rises to around 3,650–3,660 m (about 12,000 ft), a typical elevation for the southern Altiplano.average elevation of 3,660 metres
The upper layer of Salar de Uyuni is a thick, hard crust of halite that can support vehicles crossing the expanse when conditions permit.thick, hard crust of salt Beneath this crust lies a sequence of halite and mud layers saturated with brine, forming one of the world’s largest evaporite deposits.evaporite field over 10,000 sq km Across much of its extent, the vertical relief of the surface is less than a metre, a flatness that has made Salar de Uyuni a reference surface for the calibration of satellite altimeters.less than 1 meter of vertical relief
From prehistoric lakes to a desert of salt
The basin containing Salar de Uyuni is part of the broader Andean plateau shaped by tectonic uplift and the presence of an ancient inland sea. The salt flat occupies what was once the deepest part of a large Pleistocene lake system on the southern Altiplano, including bodies identified as Lago Minchin and Lago Tauca, which evaporated and shrank over tens of thousands of years.Lago Tauca on the southern Altiplano As these lakes retreated, they left behind thick accumulations of dissolved salts that crystallised into the broad, bright crust seen today.
Geologically, Salar de Uyuni is an evaporite field largely composed of massive crystalline halite overlying muds and other sedimentary units.massive halite and mud layers The surrounding region is dominated by Cenozoic volcanic rocks, mainly andesitic in composition, which contribute minerals to the basin and frame the horizon with distant volcanoes.Cenozoic volcanic rocks largely andesitic Over geological time the balance between inflow from rivers and rainfall, and intense evaporation at high altitude, has maintained the salt flat as an arid, mineral-rich surface rather than a permanent lake.
Lithium, salt extraction and the town of Uyuni
Beneath the white crust of Salar de Uyuni lies a brine rich in dissolved minerals, including substantial quantities of lithium. Studies and government estimates indicate that this brine contains a significant share of the world’s known lithium reserves, making the salt flat a major focus of interest for battery and electronics industries.50% to 70% of the world's known lithium reserves Alongside lithium, the salar contains important amounts of common salt and other elements such as potassium, boron and magnesium that contribute to its economic value.reserves of lithium, potassium, boron and magnesium
Salt extraction takes place at various points around the edges of the flat, where small operations harvest blocks and granules of halite from the surface. Several settlements on or near the shores, including local communities within PotosĂ Department, work with salt and serve as bases for journeys into the salar.saltworks at Salinas de Garci Mendoza, Llica and Calcha The nearby town of Uyuni, which gives the salt flat its name, functions as a regional hub on the Altiplano with road and rail connections and accommodation for travellers heading towards the white expanse.
Visiting Salar de Uyuni: what travellers from Western Europe should know
- Salar de Uyuni lies in southwest Bolivia on the Altiplano, reached most commonly via the town of Uyuni, which has road and rail links within the PotosĂ region.
- The surface of the salar is a hard salt crust at over 3,600 m (11,800 ft), and excursions typically involve travel across open flats with exposure to sun, altitude and wide horizons.
- The surrounding terrain includes volcanic uplands and smaller salt flats, and approaches often combine vehicle tracks on the plain with short walks on firm but uneven ground.
- Spanish is the official language 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.
Searching for Salar de Uyuni on social platforms
These links open searches for Salar de Uyuni on each platform.Frequently asked questions about Salar de Uyuni
Where is Salar de Uyuni?
It is in southwest Bolivia on the Andean Altiplano, mainly in the Daniel Campos Province of the PotosĂ Department, close to the town of Uyuni.
What should travellers expect on a visit?
Travellers encounter a wide, bright salt crust at over 3,600 m altitude, long vehicle journeys across the flat and open views framed by distant volcanic peaks.
What makes Salar de Uyuni distinctive?
Its combination of vast, level salt surface, high elevation and mineral-rich brine beneath the crust, including major lithium deposits, sets it apart among the world’s evaporite basins.
