There is a place in southwestern Bolivia where the earth becomes a mirror. After rain, a thin layer of water transforms a 10,582-square-kilometre expanse of salt into a near-perfect reflection of the sky — clouds floating below your feet, horizon dissolved, sky and earth indistinguishable. The Salar de Uyuni is the world's largest salt flat, and in the wet season, it becomes one of the most visually arresting places on the planet.
What Is the Salar de Uyuni?
The Salar de Uyuni sits at 3,656 metres above sea level in the Potosí Department of southwestern Bolivia. It formed from the transformation of prehistoric lakes that dried up over millennia, leaving a flat crust of salt estimated at 10 billion tonnes — roughly 70% of the world's known lithium reserves sit beneath the surface. The crust averages between 2 and 10 metres deep and is so flat that NASA uses it to calibrate satellite altimeters from space.
When to Visit
The Salar offers two completely different experiences depending on season:
- Wet season (November–March): Rainfall creates the famous mirror effect — a few centimetres of water produce the reflections that make the Salar world-famous. This is also the season for the flamingo colonies that nest on the coloured lagoons at the southern edge of the altiplano.
- Dry season (May–October): The salt crust is completely exposed — brilliant white hexagonal tiles stretching to infinity. Perfect for the surreal perspective photos (using forced perspective to make humans look tiny) and for uncrowded exploration. Clearer skies.
Getting There
The gateway town is Uyuni, a small, utilitarian town with no shortage of tour operators. Flights connect Uyuni to La Paz (1 hour) and Sucre, or you can take an overnight bus from La Paz (10–12 hours). From Uyuni, all Salar visits are done by 4WD tours.
Tour Options
- Day tour: Covers the salt flat, Incahuasi Island (a cactus-covered coral island rising from the salt), and some perspective photography. Typically $30–$50 per person.
- Sunset/sunrise tour: The light on the Salar at these times is exceptional — rosy pink and deep gold. Costs slightly more than a standard day tour.
- 3-day Southwest Circuit: The classic Salar experience. Covers the salt flat plus the spectacular altiplano to the south: coloured lagoons (Laguna Colorada is red-pink from algae; Laguna Verde is turquoise-green from minerals), active geysers at 5,000m, geothermal hot springs, flamingo breeding grounds, and the Dalí Desert. Ends at San Pedro de Atacama, Chile. Budget $80–$150 per person for a 3-day shared 4WD tour including accommodation in salt hotels or basic hostels.
Practical Tips
- Altitude: Uyuni sits at 3,665m and the tour circuit reaches 5,000m. Allow 1–2 days to acclimatise in La Paz or Sucre before visiting. Altitude sickness is real — move slowly, stay hydrated, and consider acetazolamide.
- Temperature: Days can be warm in the sun, but nights on the altiplano drop well below freezing year-round. Pack serious cold-weather gear.
- Sunscreen: The reflectivity of the salt amplifies UV radiation significantly. SPF 50+ and sunglasses are essential even on cloudy days.
- Cash only: Uyuni operates almost entirely in cash Bolivianos. ATMs exist but are unreliable. Bring sufficient cash from La Paz.
- Photography: Bring a wide-angle lens if possible. A tripod is useful for wet-season reflections at dusk and dawn.