Caves and potholes in Obac, Serra de l'

The serra de l’Obac forms, together with Sant Llorenç del Munt, a single massif protected as a natural park, though administratively it is often distinguished as the Bages slope, while Sant Llorenç del Munt is more associated with Vallès Occidental. It shares the same conglomerate substrate and the same abrupt relief, with an equally numerous catalog of cavities, made up mostly of small caves and shelters carved into the not-very-compact rock.