This Park, managed by CONAF, was declared a Biosphere Reserve in 1985. It has one of the last forests of Chilean Palm, an endangered species. Among its forests it is possible to find:
Tree species such as: lingues, canelos, litres, colihues, maquis, radales, palo santos, peumos and boldos, among others.
The fauna that, with detention, it is possible to observe: chinchillas, foxes, vizcachas, owls, tenches, diucas and even eagles.
Within the enclosure there are three sectors:
Granizo Sector: favorite for those who practice climbing and trekking. Through several demarcated trails: the Andean Trail, through it, it is possible to reach the top of Mount La Campana, which is approximately 1,850 meters above sea level. As a rule, visitors who wish to make a summit have until 09:30 hrs., To enter this sector, the route (round trip to the starting point) may require 08 hours (approximate). Until August 31, 2018, you can only ascend to the La Predosticada mine sector, as a security measure: access to the top of Cerro La Campana CLOSED. Los Peumos-Portezuelo Ocoa Trail: With a route of 5.5 km, the viewpoint of the Ocoa and Olmué Valley is suitable for observation of flora and fauna. Your travel time is 3 hours (one way), and the trail is connected internally to the three sectors of the park.
Sector of the Cajón Grande: the circuit offered in this sector corresponds to: Path The Plateaux, of 4.2 km, which can be covered in 2:30 hours (one way) to observe the flora and fauna of the place, standing out the waterfall of about 30 meters high.
Path Los Robles-Portezuelo Ocoa: From 4.4 km., You can also observe flora and fauna, finding examples of Robles de Santiago (Nothofagus macrocarpa) during most of the route.