The processes of dissolution of limestone lead to the existence of almost all forms associated with karst landscape.
Poljes as the Nava, sinkholes of Hoyones and the spectacular lapiaz of Lanchares are unrepeatable examples.
Subterranean forms are also present with numerous caves and chasms, among which are the Bat and the Goat, respectively.
Upwelling or springs located at the foot of the mountains tell us that all this massif, and adjacent, They are pierced as if they were a gruyere cheese. Therefore there are few watercourses, as river Bailón.