In the Serra del Cairat, near the Coll de Cassot, in Esparreguera. We must follow the same itinerary as to go to the Avenc Montserrat and the Avenc del Fum. From the latter we will have to follow about 30 metres towards the S and we should find the pits of the Clast. All three are arranged from N to S. The northernmost is the Avenc III del Clast, a few metres further on is the Avenc del Clast and continuing towards the S, very close by, is the Avenc II del Clast. Approximate coordinates and very difficult location due to the exuberant vegetation that covers the whole area. In the topography section a map prepared by Xavier Badiella is included, on which most of the cavities of the area are located and which can help in their location.