Grotte di Castelldefels

Castelldefels, a municipality in the Baix Llobregat, has 10 catalogued cavities: 3 pits and 7 caves. Together they total 357 m of passage and reach a maximum depth of 43 m. The lithologies present are dolomite, in 5 cavities, and limestone, also in 5.

The Avenc de les Granotes, in the Montemar neighbourhood, is the longest and deepest cavity in the municipality, with 140 m of passage and 43 m of depth, and it features shafts, galleries and flooded levels. It is followed in length by the Cova del Centenari, at 66 m, discovered on 6 October 1996 by the UME de Gavà, and the Cova de Can Aymerich and the Cova Fumada, both at 35 m. As for depth, after the Avenc de les Granotes come the Avenc de Roca Negra, at 7 m, documented and surveyed in 2013, and the Cova de Can Aymerich, at 6 m.

Other cavities in the municipality are the Cova del Centenari, with 5 m of depth, and the Avenc del Collet, at 4 m, discovered and explored by the GES – CMB in June 1955 and rediscovered in April 2019.