A high mountainous site in the Pyrenees, reaching up to 2,915 metres above sea level, consisting of humid meadows, alkaline fens, bog woodland, several pools and a small alpine lake. The Site offers habitat to several rare plant and animal species including the vulnerable Pyrenean desman (Galemys pyrenaicus) and the near-threatened Pyrenean brook salamander (Calotriton asper). It is also the most easterly known site for Aurelio’s rock lizard (Iberolacerta aurelioi) which has a very restricted distribution range and is endemic to the Pyrenees. The Site is important for the provision and purification of water as well as for the general hydrological balance of the area. In terms of cultural heritage, the Site contains remains of constructions related to traditional activities of iron mining and livestock breeding, the latter still practiced today. The Site is also increasingly used for tourism and recreation as well as for research. The park contains a visitors’ centre, and a botanic garden featuring around 300 species of sub-alpine and alpine flora. There are also interpretive trails with information on birds, butterflies and wetlands (located outside the areas in question). Guided tours are organized within the Site.