The Cadí-Moixeró Natural Park was created in July 1983 in response to the need to protect the Sierra del Cadí and the surrounding area. It has a total surface area of 41,342, ha. which makes it - together with the recently established Alt Pirineu Natural Park - one of the largest parks in Catalonia. The park stretches across three comarcas (rural districts): L'Alt Urgell (Spain), El Berguedà and La Cerdanya (Spain).
The Cadí and Moixeró which are connected by the Tancalaporta pass, form an imposing mountainous barrier in the Pre-Pyrenees. They extend 30 km from west to east and divide the water courses of the rivers Segre (La Cerdanya and L'Alt Urgell) and Llobregat (Berguedà).