Cotacotani Lagoons: A High-Altitude Volcanic Wetland in Lauca National Park

The Cotacotani Lagoons sit at 4,350 meters in Lauca National Park, roughly 4 kilometers northwest of Lake Chungará along the Arica–La Paz international highway (Route 11-CH). This cluster of interconnected emerald lagoons, covering about 600 hectares, formed when lava flows from the Parinacota volcano blocked meltwater and created a natural reservoir. The lagoons are free to visit as part of the national park, but the altitude demands respect — most travelers feel the thin air immediately.

What Makes Cotacotani Geologically and Ecologically Distinct

How Volcanic Activity Created the Lagoons

About 8,000 years ago, a massive collapse on the western flank of Parinacota volcano sent debris and lava flows across the altiplano. These flows dammed the drainage, forcing snowmelt and underground seepage from Lake Chungará to pool into a series of shallow basins. The result is a maze of channels, islets, and rocky outcrops that breaks the landscape into four main lagoons. The lava field itself — known as the Cotacotani lava field — remains visible around the water, with dark andesitic rock contrasting sharply against the emerald surface. A small mechanical gate regulates the outflow toward the Desaguadero River, which becomes the Lauca River; the lagoons function as a natural reservoir for the basin.

Wildlife and Flora in the Wetlands

The lagoons support more than 130 native species, including three flamingo species (Andean, Chilean, and James's) that feed in the shallow, alkaline water. Vicuñas graze the surrounding bofedales — high-altitude wetlands that stay green year-round. Vizcachas, rabbit-like rodents, sun themselves on the lava rocks and are remarkably approachable. I've seen them let hikers within a few meters before scurrying off. The birdlife is richest between November and March, when migratory species arrive, but the resident flamingos and giant coots are present all year. Bring binoculars; the birds often stay on the far side of the lagoons.

The Payachatas Viewpoint

From the official lookout on Route 11-CH, you get a sweeping view of the twin Payachatas volcanoes: Parinacota (6,348 meters) and Pomerape (6,282 meters). On clear mornings, their snow-capped cones reflect perfectly in the lagoon — a scene that photographers chase. The viewpoint has a small parking area and interpretive signs, but no facilities. The road here is busy with trucks struggling uphill at 10–20 km/h, so pull off completely before stopping. I found the light best before 9 a.m., when the wind is calmest and the reflection is sharpest.

Practical Planning for Your Visit

Getting There from Arica or Putre

The lagoons lie 44 kilometers from Putre and about 175 kilometers from Arica via Route 11-CH. The drive from Arica takes roughly 3–4 hours, climbing from sea level to over 4,000 meters. Buses La Paloma runs a daily service from Arica to Putre (around 4,000 CLP one-way, departing at 7:00 a.m.); from Putre you'll need a tour or private vehicle to reach the lagoons, as no public transport goes directly. Many full-day tours from Arica include a stop at the Cotacotani lookout, often combined with Lake Chungará and the village of Parinacota. If you're driving yourself, fill up in Arica — there are no gas stations beyond Putre.

Park Entry Rules and Fees

Lauca National Park is free to enter, but you must register at the CONAF checkpoint near the park entrance (on Route 11-CH). The park is open Tuesday to Sunday; the CONAF office in Putre is open Monday to Sunday 8:30–13:00 and 14:00–18:00. Fees and hours are subject to change — check the official CONAF site for current rates. The lagoons themselves have no separate ticket, though some community-run trails on Huanca family land charge a small entrance fee (around 5,000–10,000 CLP) for guided walks. No camping is allowed at the lagoons; the nearest accommodation is in Putre or at Lake Chungará.

Acclimatization and Altitude Tips

The biggest risk here is altitude sickness. At 4,350 meters, oxygen levels are roughly 60% of sea level. Spend at least one night in Putre (3,500 meters) before visiting the lagoons — most tour operators build this into their itineraries. Drink plenty of water, avoid alcohol, and take it slow. If you feel dizzy or nauseous, descend immediately. The weather can shift fast: temperatures range from 0°C at dawn to 15°C midday, and the UV index is extreme. Pack sunscreen, a hat, and a windproof jacket. Andean weather often brings afternoon clouds, so plan your visit for the morning.

Best Time to Visit and Combining Nearby Sites

The dry season, May through September, offers the clearest skies and most stable weather — ideal for photography. July and August are the driest months, but also the coldest and windiest. The rainy season (December–March) can bring sudden storms, though the lagoons are greener and birdlife more active. The lagoons are a 15-minute drive from Lake Chungará, so combine them in one trip. The village of Parinacota, with its 17th-century church, is 12 kilometers south and worth a stop. For a longer hike, the 12.4-kilometer trail from the lagoons to Parinacota is easy and passes through bofedales where vizcachas pose on the rocks.

Frequently Asked Questions

Can you swim in the Cotacotani Lagoons?

No. The water is freezing (around 5°C), shallow in places but with soft, unpredictable bottoms, and the lagoons are part of a protected national park. Swimming is not permitted; wading is also discouraged to protect the fragile wetland ecosystem.

Is there public transport to the lagoons?

No direct public transport exists. From Putre, you'll need a tour (around 90,000 CLP per person for a guided hike) or a rental car. The road is paved but steep, with trucks moving slowly; high-clearance vehicles are not strictly necessary but give peace of mind.

How much time should I spend at the lagoons?

A typical visit lasts 1–3 hours. If you're hiking the 12.4-kilometer trail to Parinacota, allow 4–5 hours. Most day tours from Arica spend about 45 minutes at the lookout, which is enough for photos but rushed for birdwatching. I'd suggest at least two hours if you're self-driving.