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

From strange islands in a sea of blindingly bright salt to delicately colored mineral lakes in the Andean mountains, this is an unforgettable Bolivian landscape. When it dried up, it left a couple of seasonal puddles and several salt pans, including Salar de Uyuni. It was part of a prehistoric salt lake, Lago Minchín, which once covered most of southwest Bolivia. The world’s largest salt flat sits at a lofty 3653m (11,985ft) and blankets an amazing 12,000 sq km (4633 sq miles).

  • If you want to have a chance to see the beautiful mirror effect, you should visit in the wet season, which is from December to March.
  • Sunblock, lip balm with SPF, and sunglasses – the sun is very harsh at high altitudes.
  • This is when photographers go a-swarming to get the surreal effect of the infinity horizon, one of the most recognisable photographs of travelling the world.
  • The majority of travellers begin their Salar de Uyuni tour from Uyuni itself.
  • In reality, its deep red color comes from red sediments and the pigments of algae and microorganisms living in the lake.
  • However, except for January, even in the rainy season the number of rainy days is fewer than 5 per month.

Types of Tours to Salar de Uyuni 🚙

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 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.

How did this massive salt flat form? (Geological origin)

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.
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.

What are the 10 Essential Travel Items?

Here’s all you need to know about this unique experience. The fields of salt, extending as far as the eye can see and backed by distant mountains, create one of the most dramatic and unique vistas on Earth. Salar de Uyuni is the remains of an enormous prehistoric lake. In February 2024, the Copernicus Sentinel-3B mission conducted calibration activities over the salar for its Synthetic Aperture Radar Altimeter (SRAL). As part of its validation strategy, CryoSat-2 has relied on the salar, where its Interferometric synthetic-aperture radars (InSAR) capabilities were reinstated to enhance the precision of altimetric observations. The mission focused on calibrating radar-based measurements of surface topography.
Its remarkable design features walls, floors, furniture, and even igloo-shaped roofs constructed from salt blocks that are carefully harvested from the surrounding salt flat. The dry season, which lasts from May to November, offers clear skies and the opportunity to observe the unique hexagonal salt patterns. Many visitors enjoy stopping at the Salt spinmaya no deposit bonus code Museum, a quaint space made of salt bricks that features a variety of carved sculptures.

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If you are coming from Argentina it is possible to book tours that begin in Tupiza. Most people time their arrival for the morning of the start of their tour. There is nothing really of interest in Uyuni itself so it’s not worth spending much time here. Be aware that December and January are the wettest months and sometimes excessive rain can lead to tour cancellations. The clear night skies offer great star-gazing opportunities and you’ll also be able to visit some places that aren’t accessible during the wet season.

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.
It’s an absolute must-visit if you’re exploring Bolivia and South America. It’s a vast expanse of salt stretching to the horizon. If you’re travelling from Peru, the easiest route is via Peru Hop to La Paz, followed by the overnight bus to Uyuni. The most popular starting point for exploring Salar de Uyuni is the town of Uyuni, especially for travellers coming from within Bolivia. December offers the most sunshine, with an average of 7 hours of sunlight per day. January is the hottest month in Uyuni, with an average temperature of 15 °C (59 °F), while July is the coldest, averaging 12 °C (54 °F).

Lunch at Salt Hotel

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. We visited these hot springs on our 2017 tour. There is some variation in which hot springs are included in Uyuni tours, depending on the agency. On our first tour, it wasn’t part of the itinerary, but our driver still offered to take us to watch the sunset before heading to the salt hotel. And the views of the salt flats from up there are absolutely incredible.
It was once a place of ceremony in Inca times (hausi means house in Quechua). Colchani is a small salt-processing village 20 km south of Uyuni. Remnants of a former era, the disused trains lie abandoned and rusting in the salty winds. The great expanse of the white stuff, divided into hexagonal salt tiles, creates an otherworldly landscape.
Be warned that the accommodation on the budget tours is likely to be very basic. These are shared tours with five or six people per jeep and often with a Spanish-speaking guide. If you have time, take a longer tour – you won’t regret it.” If you’d like to explore further afield and get out into the surrounding landscape then opt for a two- or three-day tour. Another popular option for travellers heading north from Chile is to take a tour from the border town of San Pedro de Atacama.
Some tours include an overnight stay near the salt flats, while others return to Uyuni the same day. Three- and four-day tours to the salt flats operate from here, and booking a guided tour is strongly recommended, as crossing the border independently can be challenging. When visiting the breathtaking salt flats, consider enhancing your experience by staying at a hotel made entirely of salt.
Many first-time visitors to the area (including me!) are surprised to discover how much there is to see beyond the salt flat itself. The first such hotel, named Palacio de Sal, was erected in 1993–1995 in the middle of the salt flat, and soon became a popular tourist destination. The lithium in the salt flats contains more impurities, and the wet climate and high altitude make it harder to process. Through its reliable brands such as Gokite Oman, your journey to the largest salt flat in the world will be continuous, natural and memorable. By choosing green tours and taking care of any natural environment, it is possible to ensure that the future generations can still keep Exploring Salar de Uyuni in all its impeccable beauty.

  • Over time, as climate changed, these lakes expanded during wet periods and shrank dramatically during dry ones.
  • Also make sure you know exactly what the tour you are booking includes in terms of duration, accommodation options, guide and itinerary.
  • For travelers looking to immerse themselves in local culture and language essentials.
  • As the largest salt flat on Earth, the Salar de Uyuni is widely regarded as one of the most effective natural calibration sites for Earth-observing satellites.
  • Another popular option for travellers heading north from Chile is to take a tour from the border town of San Pedro de Atacama.
  • When I did a tour eight years ago, the accommodation was basic.

The second day includes mind-blowing Laguna Colorada and other stunning lagoons filled with flamingoes. They were visibly struggling and choking on the dust kicked up by the tour vehicles. On the way from the Uyuni Salt Flats to the flamingo lagoons, we passed a few tourists cycling along the road. Keep the high altitude, strong sun, and wind in mind. You should be an experienced cyclist and be prepared for long distances. I spent three months travelling around Bolivia, and my trip to Salar de Uyuni was the real highlight.
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.
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.
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.