Grotte di La Llacuna

The municipality of La Llacuna, in the comarca of Anoia, brings together 21 catalogued cavities: 5 pits and 16 caves. The known total passage is 991 m and the maximum depth reaches 47 m. The lithologies present are limestone, in 17 cases, and dolomite, in 4.

The longest cavity is Cova de les Rondes, with 552 m of passage, an eastern entrance near the Roca del Frare and a possible traverse from east to west. Other notable cavities are Avenc d'en Viumala, of 115 m and 47 m of depth, with a nearly horizontal entrance, shafts and legends; Cova de Cal Sant, of about 60 m, formed by a landslide of strata, which served as a hiding place during the war of 1936 and has been the subject of speleological and biospeleological work; Avenc d'Ancosa, of 50 m and 26 m of depth, begun in 1907 by the Club Muntanyenc; and Avenc de Cal Sant, of 31 m, with a narrow gallery and a small shaft of about 3 metres.

Among the deepest cavities there are also Cova de les Rondes, with 37 m; Avenc de les Garses, of 17 m, near the easternmost entrance of cova de Les Rondes; and Esquerda de la Roca del Frare, of 12 m, located inside the trench of cova de Les Rondes, below the Roca del Frare.