The Nature Park of the Alto Pirineo (high Pyrenees) is another privileged area. Its surface area totals more than 60.000 hectares, making it the largest of all of Catalonia. It is nestled between Pallars Sobirà and Alt Urgell and offers a wide diversity of landscapes and ecosystems.
Going into the park we can see bears, otters, vultures, white grouse, the Pyrenees lizard and the Pyrenean desman, a strange animal from the mole family which is indigenous to the region.
There are zones which stand out for their geological interest. The Certascan lake, the largest glacial lake of Catalonia, the Cigalera of the Obaga of Valeran (or of Jean Paul Larrégola) which holds one of the deepest chasms of the Catalan territory and is home to elements of enormous natural value, such as a subterranean lake and various large galleries.
Above all, it is important to stress the existence of zones of great geological interest; particularly with respect to their geomorphological, hydrological and hydro-geological features. By way of example, we could mention L’Estany de Certascan, which is the largest glacial lake in Catalonia, or La Cigalera de l’Obaga de Valeran (or of Jean Paul Larrégola), which is one of the deepest potholes in Catalonia, with a maximum depth of 320 m and a course of 365 m. It was contains elements of incommensurable natural value, such as an underground lake, several large caverns, and various galleries that follow the joints of the geological materials.