The Pitrén people were the first horticulturalists to inhabit the lands between the Bío Bío River and the northern shore of Lago Llanquihue. In the East, they were present on both sides of the Andes Mountains, and in the west they occupied the lands up the Nahuelbuta Range. The landscape here is dominated by temperate rainforest, which covers the land from the Pacific coast all the way to the Andean foothills. Between the forest and the eternal snows of the high Andes are forests of Araucaria trees, a coniferous species endemic to this region.