The Cadí-Moixeró Natural Park was created in 1983 with the aim of protecting one of the richest areas in terms of flora and fauna in Catalonia. It is the largest natural park in Catalonia, and is part of three regions: Alt Urgell, Berguedà and Cerdanya.
It is mainly calcareous and includes the pre-Pyrenees relief, made up of the Cadí and Moixeró mountain ranges, Pedraforca massif and a large part of the massifs of Tosa and Puigllançada.
The Cadí and Moixeró mountain ranges, joined by the Tancalaporta pass, make an impressive mountainous border. Its slopes, particularly those on the north, form sheer crags with almost vertical walls and deeply etched valleys.