Villarrica: A Deep Dive into Chile's Lava-Lake Volcano
Rising above the lakeside resort town of Pucón in Chile's southern Lake District, Villarrica is one of the most active volcanoes in South America. Its near-perfect cone, white with snow and ice, conceals a rare and mesmerising feature: a persistent lava lake that glows at the bottom of its summit crater. On clear nights the crater radiates a soft red light visible from the town below, a reminder that this beautiful mountain is permanently restless.
A classic Andean stratovolcano
Villarrica reaches about 2,847 metres and is a textbook basaltic-andesite stratovolcano of the Southern Andes. It sits within Villarrica National Park, flanked by araucaria forests and surrounded by lakes carved by ancient glaciers. The volcano is part of a chain that runs along the boundary where the Nazca Plate dives beneath South America, the engine that has fed Andean volcanism for millions of years.
The lava lake
What sets Villarrica apart is its open vent and persistent lava lake — one of only a handful on Earth. The lake's level rises and falls as gas and magma move through the conduit, and its activity ranges from quiet bubbling to vigorous spattering and lava fountaining. This open system makes Villarrica a natural laboratory for studying how magma degasses, but it also means the volcano can shift from calm to dangerous quickly.
The 2015 eruption
In the early hours of 3 March 2015, Villarrica produced a sudden, dramatic eruption. A towering fountain of incandescent lava burst from the summit, lighting the night sky above Pucón and prompting the evacuation of thousands of residents and tourists. The paroxysm was short-lived but spectacular, and it underlined how rapidly the lava lake can escalate. The event was captured in striking footage that circulated around the world.
The lahar hazard
Like Cotopaxi and other ice-clad volcanoes, Villarrica's greatest danger lies in lahars. Its summit glaciers can melt rapidly during an eruption, sending mudflows racing down the valleys toward populated areas including Pucón and Villarrica town. Past eruptions have produced destructive lahars, and modern hazard maps focus heavily on the drainages most likely to channel these flows.
Climbing to the crater
Villarrica is one of the most popular volcano climbs in Chile. Guided groups ascend the snow-covered flanks, often using crampons and ice axes, to reach the crater rim where they can peer down toward the glowing lava lake and feel the heat and sulphurous gases rising from below. The descent is famous for the option to slide back down the snow slopes. Access is tightly controlled and depends on the volcano's daily activity level.
A long eruptive record
Villarrica has erupted dozens of times since the arrival of written records, making it one of the most frequently active volcanoes on the continent. Its behaviour is dominated by relatively mild but persistent activity punctuated by occasional larger explosions. This long, well-documented record helps scientists interpret its current behaviour and anticipate changes in the lava lake.
Monitoring and the local economy
Chile's national geology and mining service maintains close watch over Villarrica with seismometers, cameras, and gas sensors, issuing colour-coded alerts that guide the tourism industry on which the region depends. Pucón thrives on adventure tourism built around the volcano, the lakes, and the surrounding forests, creating an intimate relationship between a community and the living mountain at its doorstep.
Explore on the map
Villarrica stands among a remarkable line of active volcanoes in Chile's Lake District, from Llaima to Osorno and Calbuco. Explore it on the interactive map — filter by country to see Villarrica alongside Chile's other great stratovolcanoes and to trace the volcanic spine of the Southern Andes.