It is located 18 km from Puerto Varas and 82 km northeast of Puerto Montt. With an area of ​​175 km² and 36 km long, it is also known by the name of Esmeralda, due to the color of its waters. The Todos los Santos Lake has a volcanic origin, since the lava from the Osorno volcano created the barrier in the valley and diverted the waters of the Petrohué River that previously emptied into the Llanquihue Lake towards Ralún. It is located in an environment surrounded by forests of coigües, ulmos, tepas, tineos and olivillos and the Osorno, Puntiagudo and Tronador volcanoes. At higher elevations the lenga forests appear. Mammals such as pumas, pumas, foxes, the huillín or river otter and the quique can be found in the surroundings of the lake. In turn, Chilean marsupial species such as the trompuda weasel and the mountain monkey are presented. Among the birds it is important to highlight the presence of the huala, quetro duck, correntino duck, kingfisher, traro, small hummingbird, black woodpecker, caiquén, common tagua and eagles.