Salar de Uyuni: Formation, Geology & The Worlds Largest Salt Mirror

02/08/2026

English-speaking guides aren’t standard so check with the tour company if one is included. Unless you’re confident in your Spanish skills, you’ll likely get more out of a tour with a guide who speaks English. There was so much more to see than I expected and the locations on days two and three were far less crowded because there were no daytrippers at these sites.
Salar de Uyuni, located in southwest Bolivia near the crest of the Andes, is a remarkable natural area set in a high-altitude environment. One must-do activity in Bolivia is exploring the Salar de Uyuni, the world’s largest salt flat. Bolivia, located in the heart of South America, offers diverse travel experiences that can be enjoyed on a budget.
On our first tour in 2017, although it wasn’t windy at all, the lake had a greenish tint. In the morning, when most tours come to Laguna, you won’t see the emerald green color. Laguna Colorada, or the Red Lagoon, is a shallow salt lake home to thousands of flamingos. I don’t think this stop was included in tours eight years ago. Another salt flat close to the Chilean border, Salar de Chiguana is a little sister of Salar de Uyuni.

Not sure where to start?

We chose a Spanish-speaking tour, and our basic Spanish was more than enough. It’s worth mentioning that you will spend most of your time in the car. So, below are a few points to know before choosing a tour. I recommend booking in person, as it’s usually cheaper.
Some people decide to skip Isla Incahuasi and just walk around it to save 30 Bs, but I think it’s money well spent. There’s a short walk to the top of the island, and the entry fee is 30 Bs (not included in the tour price). Except for two cacti-filled islands, Salar de Uyuni is completely flat, creating an endless horizon perfect for fun perspective shots. Salar de Uyuni is a paradise for photographers. This is the area where salt is dug up, piled into large pyramid-shaped mounds, and left to dry in the sun.
During the rainy season (usually December–March), a thin layer of water spreads over the salt surface—sometimes just a few millimeters, sometimes a bit more. As you may have deduced by the name, the salt flats are near Uyuni in Bolivia, the starting point of most tours. The plateau includes fresh and saltwater lakes as well as salt flats and is endorheic. It leaves a permanent imprint on any traveler whether it is the glittering salt plains in the dry months or the fantastical reflections in the rainy seasons, this is a natural wonder which is unforgettable. Your trip starts with the small town of Uyuni that is the central point of the salt flat tours. Catch a local bus to Colchani (this is a stop on tours to visit a salt museum).
Laguna Verde (Green Lake) turns green when strong winds lift the sediments of arsenic, copper, lead, and other minerals from the bottom of the lake. To add to the experience, we could see flamingos at Laguna Challviri. On our 2025 tour, we practically had the place to ourselves and enjoyed it more, as there was only one other group besides us. Challviri Hot Springs are tucked away near Laguna Challviri and are much quieter and usually less visited. The water is about 29 degrees Celsius and contains minerals that relieve the symptoms of arthritis and rheumatism.

  • Salar de Uyuni is the largest salt flat in the world, with an area of approximately 10,582 square kilometres (4,086 mi2).
  • Read more about visiting Salar de Uyuni independently here.
  • The second day includes mind-blowing Laguna Colorada and other stunning lagoons filled with flamingoes.
  • In the salt flat, in the middle, there is an island known as Isla Incahuasi that is composed of ancient coral and is covered with giant cacti some of which are over 1,000 years old.
  • On our 2025 tour, the sunset was included in the itinerary, and we had wine and snacks while watching the sunset.
  • It’s possible to book ahead or choose a tour company on arrival.

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A hot spring area with geysers and steaming vents, offering a unique geological experience. Isla Incahuasi, also known as Cactus Island, is a small, rocky outcrop located in the middle of the Salar de Uyuni, the world’s largest salt flat, in Bolivia. The ideal time for stargazing is during the dry season (April spinmaya no deposit bonus code to November) and particularly around new moon phases, when the skies are clear and dark. It holds half of the world’s lithium reserves and its vast, flat surface makes it an ideal location for calibrating satellite radar altimeters, which measure surface topography.

Day 2 – Heading south to Laguna Colorada

If travelling to Uyuni by bus you will arrive early in the morning (around  6 or 7 am) and most tours begin at around 10 am, giving you time to scout around for a tour you like. During this time the salt is covered by a layer of water that provides a dramatic mirror effect and creates unique conditions for fabulous photos. At this time of year you will enjoy the quintessential views of the salt flats, with vast expanses of white landscape extending to the horizon.

Main Timer setup

Relax in the thermal waters of the Polques Hot Springs after exploring the salt flats. The Train Cemetery, also known as “Cementerio de Trenes,” is a significant tourist attraction near Uyuni, Bolivia, and within the Salar de Uyuni salt flats. For the adventurous, cycling or hiking across the salt flats is possible, but requires preparation and experience in arid environments. During the rainy season, water can fill parts of the salt flat, creating a stunning mirror-like effect. The salt flats are at 3,656 m.a.s.l. Some people can suffer from altitude sickness at this elevation.

  • In February 2024, the Copernicus Sentinel-3B mission conducted calibration activities over the salar for its Synthetic Aperture Radar Altimeter (SRAL).
  • But in the wet season, a thin layer of water transforms the surface into the world’s largest mirror, reflecting the blue altiplano sky and the clouds.
  • (There are no day buses for some reason.) Local buses can be booked on busbud.com.
  • There are usually fewer tourists and no entry fee.
  • The tour takes you through elevations ranging from about 3,600 m to 4,800 m.

The thermal waters are delightfully warm and while you’re bathing you can soak up the beautiful scenery. While you might not fancy stripping off when it’s -10°C, you absolutely won’t regret it if you do – trust me! The hot springs of Polques are the perfect place to take a break and relax. Utilising the abundant material to hand, the innovative locals created entire buildings out of salt bricks. (Note that Incahausi can become inaccessible in the wet season due to flooding.) In the middle of the salt wilderness, this tiny oasis is covered in towering cacti.

However, if you are travelling from La Paz (which is at a similar altitude) or Cusco (just 250 m lower) then you will likely be fine as you should have acclimatised. For private tours expect to pay significantly more. These are shared tours with usually five or six people per jeep.

Warm clothes – the altitude is high, and it gets quite cold at night, and below zero in winter months (June to August). If you don’t like rain and prefer dry weather, visit between May and November. But keep in mind that even in this season, there is no guarantee you will see the reflective effect. Unfortunately, our tour didn’t take us right to the lagoon; we could only see it from far away. On 2025 tour, it was very windy, and Laguna Verde had a bright green color. So there is no guarantee the lake will be green when you come there.
The first night’s stay in a salt hotel was very clean and comfortable, with fresh bedsheets, towels, and toilet paper provided. In 2017, on the first night, we stayed in private rooms in a salt hotel. If you want to see the sunset at the Salar de Uyuni, ask your travel agency whether it’s included. Most tour agencies start their tours at 10.30 am.
Salar de Uyuni is the largest salt flat in the world, with an area of approximately 10,582 square kilometres (4,086 mi2). Sustainability has gained a critical concern as an increasing number of tourists head to Salar de Uyuni. When you are travelling to other neighbouring countries such as Chile or Peru, over land routes via San Pedro de Atacama and Puno are equally beautiful scenic routes as you go. The vast majority of the visitors arrive at Salar de Uyuni through the Bolivian capital, La Paz. According to many travelers it is one of the most intense stargazing moments of their existence.
Collectively, these features make the Salar de Uyuni approximately five times more effective for satellite calibration than the surface of the open ocean. Salar de Uyuni is a popular tourist destination, and consequently a number of hotels have been built in the area. Because of its location, large area, and flatness, the Salar is a major car transport route across the Bolivian Altiplano, except when seasonally covered with water. However, except for January, even in the rainy season the number of rainy days is fewer than 5 per month. It is covered with a solid salt crust varying in thickness between tens of centimeters and a few meters. Lacustrine mud that is interbedded with salt and saturated with brine underlies the surface of Salar de Uyuni.

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