Salar de Uyuni, a vast white mirror of the Bolivian Altiplano

Salar de Uyuni near Uyuni in Bolivia is a vast high?altitude salt flat where sky and ground merge into one luminous horizon.

Southwest Bolivia holds one of the strangest landscapes on Earth: Salar de Uyuni, a vast salt flat on the Altiplano where sky and ground can appear to merge into a single white and blue plane.

A high-altitude salt sea turned to stone

Salar de Uyuni lies in the Bolivian Andes on the Altiplano plateau, at an elevation of about 3,653 m (11,995 ft) above sea level.Altiplano plateau It occupies the deepest part of a closed inland drainage basin in the south of the Altiplano, where water arriving from rainfall and rivers has no outlet except evaporation.closed inland basin

The salt flat covers roughly 10,582 square kilometres (4,086 sq mi), forming what is widely recognised as the largest continuous salt crust on the planet.10,582 square kilometres The broad, almost level surface shows elevation variations of less than 1 m across tens of kilometres, a flatness precise enough for space agencies to use it as a calibration site for satellite instruments.calibration site for satellite instruments

Layers of salt and lithium beneath a blinding crust

Although visitors see a hard white surface, the structure of Salar de Uyuni is more complex than a simple pavement. The upper crust consists mainly of halite, the mineral form of sodium chloride, with smaller amounts of other evaporite minerals such as gypsum.halite-rich crust Beneath this crust lies a subsurface layer of brine, enriched in dissolved salts including lithium, potassium, boron and magnesium.subsurface brine layer

The brine underneath Salar de Uyuni holds some of the largest known lithium reserves in the world, making this landscape both a geological wonder and a major strategic resource for battery production.large lithium reserves For travellers, the economic importance is not visible in installations across most of the flat; what stands out instead are the salt polygons on the surface and isolated features such as low islands of volcanic rock rising out of the white expanse.

Seasonal transformations: from salt tiles to mirror

In the dry season, the surface of Salar de Uyuni forms sharply defined polygons of salt, giving the impression of endless interlocking tiles stretching in every direction.polygons of salt The plain then appears as a blinding white sheet under intense high-altitude sun, with distant mountains floating on the horizon.

When seasonal rains spread a thin layer of water across parts of the salt flat, Salar de Uyuni changes character. The water covers the crust in a shallow film, and the combination of flat surface and clear Andean air can turn the area into what is often described as a natural mirror reflecting clouds, sunsets and stars.shallow seasonal flooding This reversible transformation between textured salt tiles and a reflective surface is one of the defining visual experiences of the region.

Visiting Salar de Uyuni: what travellers from Western Europe should know

• Salar de Uyuni lies in southwest Bolivia near the town of Uyuni, on the Altiplano plateau; journeys commonly start or end in Uyuni, Potosí Department.
• The salt flat stands at over 3,600 m (11,800 ft), so visitors spend time on high-altitude terrain exposed to sun and wind, with long stretches of walking on hard salt surfaces.
• The landscape consists of open salt crust broken by islands of rock and low ridges; approaches to viewpoints and formations can involve walking over uneven ground and climbing short slopes.
• The official language is Spanish and the currency is the Bolivian 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?

Salar de Uyuni is in southwest Bolivia on the Altiplano plateau, within Potosí Department near the town of Uyuni.

What should travellers expect on a visit?

Travellers encounter an extensive high-altitude salt surface, strong sunlight, long drives or walks across open terrain and isolated rocky islands rising from the flat.

What makes Salar de Uyuni distinctive?

Its combination of extreme flatness, vast area and seasonal transformation from patterned salt crust to reflective water surface gives it a character unlike other highland landscapes.