This beautiful natural sight takes us back in time, to when it was a forest: lava flows from the eruptions of Lonquimay volcano blocked several small streams, and over time this lovely lagoon formed, with a sunken forest beneath its surface.
You can see the lagoon in the distance from the volcano viewpoint. To reach it, the advice is to go around the lava field of Lonquimay Volcano rather than cross it, since the ground is very uneven and can cause accidents.