Laguna Verde: Bolivia's Emerald Lake at 4,300 m

Laguna Verde is a 17 km² salt lake in Bolivia's Eduardo Avaroa Andean Fauna National Reserve, sitting at roughly 4,300 metres at the foot of the Licancabur volcano on the Chilean border. Its water turns emerald because of dissolved minerals — mainly arsenic, magnesium, copper and calcium carbonate — not algae or reflection. Most visitors see it as the first or last stop on a 3-day 4x4 circuit between Uyuni and San Pedro de Atacama.

Why the Water Is Green — and When to See It

The colour is chemistry, not biology. The neighbouring Laguna Colorada is red from microalgae; Laguna Verde is green from mineral sediment in the water column. Wind is the switch. In the calm early morning, particles settle and the lake reads deep emerald; by early afternoon the usual altiplano wind has stirred the shallows and the surface shifts toward turquoise, often with white froth along the shore. Locals who drive this route say the most saturated green shows up between 8 and 10 a.m. — a detail worth insisting on when your operator sets the schedule.

The mineral load has a side effect: the lake can stay liquid at temperatures as low as -21°C, according to Lonely Planet. In July, dawn here can hit -10°C or colder, and the wind makes it feel worse. Bring a windproof shell, gloves and sunglasses; the glare off the salt crust is brutal.

The licancabur backdrop

The 5,916 m Licancabur cone rises directly behind the lake on the Chilean side. On a still morning its reflection sits in the green water — the shot everyone wants. There is also a second, lower volcano, Juriques, to the west. The shoreline is a hard salt crust over dark mud; step on the white algal mats and you will leave footprints that last years. Swimming and drinking are prohibited, and the water is genuinely toxic from arsenic — keep kids and dogs away from the edge.

Dome-shaped stromatolites

A 2024 study in Ecology and Evolution documented dome-shaped microbial structures at Laguna Verde — rare geomicrobiological formations in the Central Andes. You will not be led to them on a standard tour, but knowing they exist explains why scientists treat this lake as a Mars analogue. Several astrobiology teams have used the lake and its surroundings to test instruments for Martian life detection.

Getting to Laguna Verde

There is no public transport and no road sign that says "Laguna Verde" in English. Access is by 4x4 only, as part of a guided circuit. Two directions work:

From Uyuni: 3-day, 2-night tours run Bs 1,200–1,800 per person shared, including fuel, food and driver-guide. Laguna Verde is usually the final stop before the Chilean border or the first stop coming the other way.

From San Pedro de Atacama: minibuses leave around 06:30 for the 1-hour transfer to Hito Cajón, where you switch to a Bolivian 4x4. Laguna Verde is 20–30 minutes from the border post.

The reserve entrance fee is Bs 150 for foreigners at the first checkpoint (prices change — check the official reserve site before you travel). Carry bolivianos in cash; Chilean pesos are useless on the Bolivian side. There is no ATM, no fuel station and no shop between the border and the lake.

What to expect on the drive

Roads are ungraded gravel and washboard. Between Sol de Mañana geysers and Laguna Verde it is about 52 km of open altiplano, and you will feel every kilometre. A shared 4x4 seats six passengers plus the driver; if you are prone to motion sickness, take the front seat and skip the heavy breakfast. Most tours allow 45 minutes to an hour at the lake — enough for photos, not enough for a proper walk. If you want longer, ask your operator before booking; some custom itineraries allow 90 minutes.

Best Time to Visit and How to Plan the Stop

The dry season, roughly April to October, gives clearer skies and more reliable colour. June to August is coldest — night temperatures near -30°C have been recorded in this part of the reserve — but the light is sharp and the crowds thinner. January and February bring rain and cloud; the lake still looks green, but reflections are less reliable and the tracks can turn to mud.

Time your stop for morning. Afternoon wind is a near-certainty in this exposed corner of the altiplano; the surface gets choppy and the green turns milky. If your tour arrives at midday, accept it — but ask your driver to swing back past the lake on the way out if the schedule allows. Many itineraries do Laguna Verde and Laguna Blanca back-to-back; the contrast between the green and the white lake a few hundred metres apart is the most photogenic pairing on the whole circuit.

Combine it with the rest of the reserve

Laguna Verde rarely stands alone. The standard 3-day Uyuni circuit links it with the Salar de Uyuni salt flat, Laguna Colorada, the Sol de Mañana geysers, the Árbol de Piedra rock formation and the hot springs at Termas de Polques. If you are crossing to Chile, the lake is your last Bolivian stop; if you are coming from Chile, it is your first. Either way, budget at least 45 minutes on site and keep your camera battery warm — cold drains them fast at this altitude.

Frequently Asked Questions

Is Laguna Verde safe to swim in?

No. The water contains high concentrations of arsenic and other minerals and swimming is prohibited throughout the reserve. Keep hands out of the water and do not let children play at the shoreline.

Can I visit Laguna Verde without a tour?

Practically, no. There is no public transport, no marked trail and no facility at the lake. Independent travellers would need a private 4x4, a driver familiar with the unmarked tracks and a reserve permit — the shared guided circuits from Uyuni or San Pedro de Atacama are the standard and cheapest option.

How long should I spend at the lake?

Most group tours allow 45 minutes to an hour. That covers the main viewpoint, the Licancabur reflection and a short walk along the salt crust. If photography is your priority, negotiate a 90-minute stop in advance; the light and wind change quickly and an extra half hour often makes the difference.

What is the entrance fee for the Eduardo Avaroa reserve?

Foreign visitors pay Bs 150 at the first checkpoint, payable in cash in bolivianos. Fees are subject to change — check the official reserve site for current rates. Chilean pesos are not accepted on the Bolivian side.