The National Park of Aiguas Tortas and Lake San Mauricio was created in 1955 and it is the only Spanish national park located in the autonomous community of Catalonia.
It is in the central part of the Pyrenees in the province of Lleida.
It presents two areas: the eastern, with continental climate that feed the lake of San Mauricio, and the western of Atlantic high mountain climate.
The geography of the park is high mountain because much of the territory surpasses the 1000 meters over the sea level, with peaks that surpass the 3,000 meters over the sea level. Among them, two valleys stand out: to the west the Sant Nicolau river valley, with its characteristic meadows and meanders.
The park has a great biological value. The elevated levels of unevenness originate the different ecosystems: meadows, crops and deciduous forests in the lower levels, evergreen forests in the midlands, and high mountain meadows and rocks at the highest levels.