Salar de Uyuni Salt Amount, Area & Altitude: Key Facts

Why Salar de Uyuni has so much salt

Salar de Uyuni's salt amount is usually given as roughly 10 billion tonnes. That number attracts attention because it turns a landscape fact into a scale problem: how did one high-altitude basin end up with that much salt?

The short answer is repeated lake evaporation. Ancient lakes on the Altiplano filled the basin, dried out, and left minerals behind. Over long periods, those cycles built a salt crust and brine-rich system large enough to make Salar de Uyuni the world's best-known salt flat.

What recent research adds

Recent scientific work on Salar de Uyuni focuses less on changing the public salt-total estimate and more on explaining the chemistry below the crust. Studies of lithium brines and halite cycling help explain how salts and dissolved minerals move through the salar system.

So the useful takeaway is not that a new 2026 study suddenly changed the 10-billion-tonne figure. It is that modern geochemistry makes the famous number easier to understand: Salar de Uyuni is a living evaporite system, not just a flat white surface.

Salar de Uyuni coordinates

Salar de Uyuni is commonly mapped at approximately 20.3333° S, 67.7000° W, or -20.3333, -67.7000 in decimal degrees.

Degrees: 20.3333° S, 67.7000° W

Decimal: -20.3333, -67.7000

Where Salar de Uyuni is located

Salar de Uyuni is on the high Andean Altiplano of southwestern Bolivia, primarily in Daniel Campos Province of Potosí Department. It occupies an endorheic basin between the Western and Eastern Cordilleras; its central area is near 20°10′S, 67°12′W. Volcanic and volcanic-derived landforms border the basin, including the Tunupa volcanic complex to the east, while the Coipasa salt basin lies to the north. Rocky outcrops rise above the salt plain as islands, among them Isla Incahuasi.

Why Salar de Uyuni is important

Salar de Uyuni has scientific, economic, ecological, and cultural significance. Its lithium-bearing brine reservoir is important to mineral development, while the flat, uniform surface serves as a stable reference for satellite-altimeter calibration and other remote-sensing applications. Indigenous Aymara and Quechua communities historically organized systematic salt extraction that supported regional economies. Nearby high-altitude wetlands and shallow lagoons support Andean, James’s, and Chilean flamingoes, connecting the salt plain with broader conservation concerns.

History of Salar de Uyuni

The salar developed as successive high-altitude lakes in the Andean basin receded and left concentrated evaporite deposits. Stages associated with these former paleolakes produced thick salt and brine deposits beneath the hard crust. Indigenous groups later developed salt-collection methods and trade networks across the Altiplano, continuing a human relationship with the basin that extends back millennia. Mineral extraction intensified during the colonial and industrial periods, when rail and transport links altered resource flows. More recently, geologic and commercial attention has centered on lithium and other dissolved minerals beneath the crust.

Natural features of Salar de Uyuni

Polygonal halite plates and shallow fissures shape Salar de Uyuni’s white surface, which also contains other evaporite minerals. Islands of older volcanic and sedimentary rock interrupt the plain; Isla Incahuasi is distinguished by dense stands of giant columnar cacti and fossil-bearing rock. Below the crust, a porous evaporite layer covers brine enriched in sodium, potassium, and lithium salts, with chemistry varying locally. The salar’s exceptional planarity and structural uniformity reflect both its depositional history and continuing evaporative concentration.

Environment, protection, and monitoring of Salar de Uyuni

Salar de Uyuni’s mineral resources are subject to national regulation and scientific monitoring, with Bolivian state agencies involved in exploration and production oversight. Geological surveys and research institutions periodically assess brine chemistry, resource volumes, and geotechnical conditions to inform management. Surrounding high-altitude wetlands and lagoons receive conservation attention for their role in supporting flamingo species and other specialized fauna. Local communities and cooperatives maintain traditional salt-working practices and participate in stewardship discussions, while governmental entities coordinate resource governance and environmental monitoring frameworks.

Salar de Uyuni facts

• Indigenous Aymara and Quechua communities historically organized systematic salt extraction from the salar, supporting long-distance exchange across the Altiplano.
• Successive high-altitude lakes, including stages commonly identified in paleolake research, deposited the evaporites that became the salar.
• Isla Incahuasi is a prominent rock outcrop within the salar that supports dense stands of giant columnar cacti and preserves shoreline evidence.
• Salar de Uyuni’s unusually uniform, reflective surface has been used in satellite-calibration and other geodetic and remote sensing studies.
• Bolivian national agencies and state enterprises oversee lithium exploration and regulation for mineral development within the salar.

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