Vicente Pérez Rosales National Park (Spanish pronunciation: [biˈsente ˈpeɾes roˈsales]) is located in Los Lagos Region, Llanquihue Province, of Chile.

The park protects the body of Todos los Santos Lake and a large part of its catchment.

A short distance downstream, still within the limits of the Park, the Petrohué river flows through the Petrohue Waterfalls.

[2] Dirección Meteorológica de Chile (Chilean Meteorological Service) published a climate summary for the 10th Region .

The Tronador and related structures are the result of volcanic activity dating back to the early Pleistocene.

At the western entrance to the Park, the symmetrical cone of the Osorno volcano forms a towering landmark over the Todos los Santos and Llanquihue lakes.

A summary of scientific information on the volcanoes of the Park (Osorno, Puntiagudo-Cordón Cenizos and La Viguería) is available from the Global Volcanism Program of the Smithsonian Institution.

These volcanoes expel large quantities of loose cinder that in depositing give the rounded conic shape.

These cinders are easily washed away by rain and surface water flow, so that the Puntiagudo, an elder brother of the Osorno, is denuded to the hard core of lava frozen inside the volcanic chimney.

In a recent geological if not historical event, rocks of volcanic origin raised the Ensenada depression between the Osorno and the Calbuco volcanoes, thus forcing the Llanquihue lake to open a new outlet to the sea on its western shore.

Generally the most common and visible tree is coihue, Nothofagus dombeyi, in changing association with other species that include muermo, also known as ulmo, Eucryphia cordifolia and tineo, teñiu, Weinmannia trichosperma.

Easily visible on beaches because of its bright orange bark is Temu, arrayan, Luma apiculata, Chilean myrtle.

Notro, fosforillo, Embothrium coccineum, Chilean firebush, has plentiful red tubular flowers and is frequent almost everywhere at the fringe of the forest.

Genista juncea, also known as Weaver's Broom, a perennial, leguminous shrub native to the Mediterranean region, toxic to animals.

Huiña, kodkod, Leopardus guigna, often mistaken for a stocky, short wild cat, is actually a member of the family of the leopards, a tiny ocelot.

Introduced European red deer, Cervus elaphus, is having negative impact on natural renewal of the forest.

One is Molina's hog-nosed skunk, Conepatus chinga; the second is lesser grison, Galictis cuja; the third is southern river otter, Lontra provocax, an endangered species.

An introduced mustelid: American mink, Mustela vison, has wrought havoc in the Parks ecosystems.

The larger ones are coipo, coypu, Myocastor coypus, a webbed-feet animal that inhabits reedy lake and river banks; and Wolffsohn's viscacha, Lagidium wolffsohni, of the family Chinchillidae, whose preferred habitat is above the timber line.

The native fish fauna in Todos los Santos lake has been upset with the introduction of several species of trout and salmon.

In the late 19th century, a regular freight and tourist service between Puerto Montt was established, together with hotels and lodges.