Laguna Lejía sits at 4,325 meters above sea level, about 105 kilometers southeast of San Pedro de Atacama. Getting there takes a 4x4 vehicle with low range (4L) and high clearance, because of deep washboard, loose ash banks and sharp volcanic rock. The basin holds colonies of all three Andean flamingo species in front of a stretch of water that mirrors the active cone of Láscar Volcano (5,592 m a.s.l.), and it serves as the vehicle approach to the start of the trail to the crater.
Because of the isolation and the state of the track, commercial vans and tourist buses do not enter this area. Traffic is limited to private expeditions for wildlife photography and mountain groups that want to climb Láscar. To handle the altitude without problems, you need at least three or four days of prior acclimatization in San Pedro.
Route fact sheet
| Parameter | Operational detail |
|---|---|
| Laguna Lejía altitude | 4,325 m a.s.l. |
| Láscar Volcano base altitude | 4,900 to 5,000 m a.s.l. |
| Distance from San Pedro | 105 km (38 km of pavement on Ruta 23-CH and 67 km of gravel and volcanic track) |
| Driving time | 2.5 to 3 hours each way |
| Required drivetrain | 4x4 with low range (transfer case with 4L) |
| Terrain | Compacted gravel, severe washboard, loose volcanic sand and andesitic rock |
| Cell coverage | None after Toconao |
| Usual wildlife | Andean flamingo, James's flamingo, Chilean flamingo, vicuña, culpeo fox and rhea |
| Window for reflection photos | 07:30 to 10:30 (before the afternoon wind arrives) |
| Prior acclimatization | At least 3 to 4 days at intermediate altitudes (3,000 to 4,200 m) |
Between Toconao and Laguna Lejía there are no gas stations, no mechanical assistance and no drinking water. You need to leave San Pedro with a full tank, a spare tire of the original size inflated to 35 psi, a 12V compressor and satellite communication equipment.
4x4 track conditions and terrain difficulties
The route leaves San Pedro de Atacama on Ruta 23-CH toward Toconao (2,475 m a.s.l.). From there you take the turnoff to Talabre (3,600 m a.s.l.), where you register and pay the community access ticket (~$10,000 CLP per person) to the Atacameño Community of Talabre. Then you join road B-357 heading to the altiplano. Once the pavement ends, the road turns to loose gravel and volcanic dirt tracks:
SAN PEDRO (2,400 m) ──[Pavement 38 km]──> TOCONAO (2,475 m)
│
[Gravel and climb 25 km] ─▼
TALABRE (3,600 m)
│
[4x4 track, washboard and ash 42 km] ─▼
LAGUNA LEJÍA (4,325 m)
│
[Steep slope and scree 8 km] ─▼
BASE LÁSCAR VOLCANO (4,950 m)
Four mechanical factors rule out vehicles without full-time or part-time four-wheel drive and low range:
- Deep washboard over tens of kilometers. On light vehicles or those with city suspension, the constant vibration loosens bolts, wears out steering ends and overheats standard shock absorbers in less than an hour.
- Deposits of fine volcanic ash in gullies and uphill bends between 3,800 and 4,200 meters. Vehicles with two-wheel drive, or all-wheel drive without a low gear (AWD), lose grip and end up high-centered on the differential.
- Sharp volcanic rocks on the slopes of Tumisa and Láscar. Blocks of andesite and dacite slash the sidewalls of road or low-profile tires. We recommend All-Terrain (AT) tires with a reinforced eight- or ten-ply casing.
- A slope over moraine and loose scree between Laguna Lejía and the base of Láscar (from 4,325 to 4,950 meters). At that altitude engines lose 40% to 50% of their power because of the thinner air; climbing without a low-range gearbox in 4L strains the clutch until it burns out.
When crossing the loose ash banks around the lagoon, we lower tire pressure to 22 or 24 psi to widen the contact patch. Before getting back on the pavement in Toconao, it is essential to reinflate to 35 psi with the vehicle's compressor.
Altiplano wildlife: flamingos and fauna
Laguna Lejía is an endorheic basin fed by groundwater from the Láscar and Aguas Calientes volcanoes and the Puntas Negras ridge. Its brackish, shallow waters concentrate microalgae and diatoms that sustain three flamingo species:
- James's flamingo or puna flamingo (Phoenicoparrus jamesi): the smallest of the three and the one that best tolerates extreme salinity at altitude. It has crimson red legs, reddish streaks on its back and a bright yellow bill with a sharply bordered black tip.
- Andean flamingo (Phoenicoparrus andinus): taller, with yellow legs and a bill whose distal half or more is black. It tends to wade in somewhat deeper areas while stirring up the bottom with its feet.
- Chilean flamingo (Phoenicopterus chilensis): recognizable by its grayish legs with pink joints and toes, and a smaller black patch at the tip of the bill.
At Laguna Lejía there are no boardwalks or fences like at Chaxa or Tebinquiche. The birds feed close to the shore in the morning and are sensitive to noise or approaches on foot, so it is best to keep your distance and watch them with binoculars or a telephoto lens.
In the grasslands and bofedales around the lagoon, herds of vicuñas (Vicugna vicugna) graze. On the tola plains you can spot rheas, or northern rheas (Rhea tarapacensis), and along the rocky edges the Andean culpeo fox (Lycalopex culpaeus andinus) patrols.
Landscape photography: the Láscar reflection at sunrise
From the east shore of the lagoon you can see the western slope of Aguas Calientes Volcano (5,924 m a.s.l.) and the cone of Láscar Volcano (5,592 m a.s.l.). To the northwest, the crater of Láscar lines up over the water with its usual plume of steam and volcanic gases.
Whether you can photograph the cone reflected in the water depends on two factors:
- Calm wind in the early hours (07:30 to 10:30). In the early morning the water usually stays still. From 11:00 on, the temperature difference between the salt flat basin and the high cordillera triggers westerly gusts of 30 to 60 km/h that ripple the surface and break up the reflection.
- Eastern light at sunrise. The low morning light hits the ash deposits and dark lava flows of Láscar head-on, creating a sharp contrast with the salt edge of the lagoon.
Connection with the Láscar Volcano ascent
Laguna Lejía serves as a reference point before the final stretch toward the Láscar Volcano ascent. Going around the northern end of the lagoon, the vehicle track keeps climbing the volcanic debris slopes to a flat area between 4,900 and 5,000 m a.s.l., where the pickups park.
From there the hike begins:
- Elevation gain: 600 meters of continuous climbing.
- Distance: 2.5 km to the crater rim (5 km round trip).
- Walking times: 2 to 3 hours up and 1 hour down.
- Terrain type: slope over ash scree, pumice and lava blocks. It requires no technical climbing or glacier travel, but the sustained incline combined with low oxygen pressure demands a slow, steady pace.
- Crater rim (5,500 m a.s.l.): the trail ends at the rim of the central crater, an opening 800 meters in diameter and 300 meters deep with active fumaroles of sulfur dioxide ($SO_2$) and steam. Those who keep a good pace and energy can add 30 to 40 minutes along the ridge to the true summit at 5,592 m a.s.l.
SERNAGEOMIN keeps constant monitoring of Láscar through the Southern Andes Volcanological Observatory (OVDAS). The massif is at Green Technical Alert and the restrictive safety perimeter has been lifted. Departures are confirmed after reviewing the day's seismic and gas emission reports; if the alert changes to Yellow or Orange, the authorities close access to the volcano immediately.
Ways to visit the area: 4x4 photo tour or mountain ascent
A visit to the basin is usually organized around two goals:
4x4 photo excursion
Designed for landscape photography, birdwatching and altiplano drives without long hikes. The vehicle reaches the lagoon early in the morning to capture flamingo activity, visits viewpoints in the area and can climb to 4,800 meters to see the basin from above before returning to San Pedro around midday.
Guided ascent to the crater
Aimed at those looking for a summit above 5,500 meters in the cordillera. It requires guides certified in remote-area first aid (WFR or WAFA), a medical oxygen cylinder in the support vehicle, trekking poles and monitoring of oxygen saturation with a pulse oximeter during the climb.
Do you want to stand on the rim of Láscar Volcano's active crater?
We guide your ascent of the most active volcano in northern Chile with our own 4x4 pickup up to 5,000 m, WFR-certified guides, pressurized medical oxygen and a technical sunrise stop at Laguna Lejía.
Required gear
Between 4,300 and 5,600 meters, expect below-freezing temperatures at dawn, constant wind and ultraviolet radiation above index 11:
- Three-layer clothing: a synthetic or merino wool base layer against the skin (avoid cotton), a second layer of fleece or lightweight synthetic insulation, and a waterproof windproof third layer.
- Thick down jacket: needed to wait with the camera still beside the lagoon and for the final wind-exposed stretch at the crater.
- Windproof thermal gloves, a warm hat and a buff-style neck gaiter to cover your nose and mouth from mineral dust and cold air.
- Category 3 or 4 sunglasses with certified UV filter and a wraparound frame; the lagoon's salt and the light-colored ash multiply the glare.
- Mid or high-cut boots with a well-lugged sole to prevent slipping on ash scree and moraine.
- Two liters of water per person, electrolytes and trail rations with quick-digesting calories (nuts, cereal bars or dried fruit).
To rent down parkas, thermal pants or poles in town, see the guide on where to rent mountain and trekking gear in San Pedro de Atacama.
Frequently asked questions
Can you reach Laguna Lejía in a two-wheel-drive vehicle or a conventional SUV?
No. The track combines continuous washboard, loose ash banks and blocks of volcanic rock that call for high clearance and 4x4 with low range (4L). A standard vehicle risks serious suspension damage or getting stuck in the sand with no help nearby and no phone coverage. Those without a suitable vehicle can turn to a 4x4 transfer for expeditions in San Pedro de Atacama.
How many days of acclimatization do you need before going up to the lagoon?
We recommend at least three days in San Pedro de Atacama with intermediate outings at altitude, such as the Guatín Canyon trek (3,200 m), the Tatio Geysers (4,320 m) or an acclimatization summit like Cerro Toco (5,604 m). You can review the stages in our acclimatization itinerary in San Pedro de Atacama.
What precautions does the Láscar crater gas call for?
The fumaroles give off sulfur dioxide ($SO_2$) and water vapor. With the prevailing westerly wind, the plume usually drifts east, away from the ascent ridge. If the wind shifts toward the trail, the gases irritate eyes and throat. Guides watch how the fumarole behaves before reaching the rim and carry masks with filters for acid gases. Anyone with asthma or respiratory conditions should check with their doctor before climbing.
Is it possible to camp at Laguna Lejía?
Night temperatures often drop below -15°C and the wind can exceed 60 km/h with no natural shelter at all. If you spend the night in the basin, you need a four-season tent that withstands mountain winds and a down sleeping bag with a comfort range of -15°C to -20°C.
Related resources
- Láscar Volcano Ascent: Fact sheet and bookings
- Cerro Toco Ascent: Fact sheet and bookings
- Cerro Toco vs. Láscar Volcano: Difficulty and experience compared
- Active volcanoes of San Pedro de Atacama: Which ones they are and how to visit them
- Altitude sickness guide for San Pedro de Atacama: Prevention and symptoms
- 4x4 transfer to volcanoes and technical approaches in Atacama
