Caves and potholes in the Serra de Finestres geological unit

Serra de Finestres is a unit of the Serralada Transversal, in Garrotxa, formed by sandstones with rock shelters and erosion cavities. It contains 11 cavities: 4 pits and 7 caves, which total 632 m of passage and reach a maximum depth of 43 m.

Among the most notable cavities are Avenc del Bloc, with 211 m of passage and 43 m of depth, known since time immemorial and explored from 1967; Cova de les Angúnies, with 190 m of passage and 40 m of depth; and Cova del Llop, with 116 m of passage and 17 m of depth, explored for the first time in 1968. Other cavities are Bora Bonica, with 31 m, explored by the SIE – CEA on 19 December 1971, and Avenc Pujolar, with 14 m of depth, discovered and explored on 4-4-1997 by the Centre Excursionista d'Olot.