Vicente Perez Rosales

Declared in 1926, it is the oldest national park in Chile, contemporary with Argentina's Nahuel Huapi on the other side of the range. Its Petrohué falls were formed when lava flows from the Osorno volcano — still visible, its profile almost perfectly conical above Lake Todos los Santos — partly dammed the river's course, creating a series of rapids and drops over dark basaltic rock unusual in waterfalls of this scale.