Grotte di Vandellòs i l'Hospitalet de l'Infant

The municipality of Vandellòs i l'Hospitalet de l'Infant contains 28 cavities: 13 pits and 15 caves. The documented total length is 935 m and the maximum depth is 109 m. The lithologies present are limestone, in 20 cavities, and dolomite, in 8.

Avenc de Vandellòs is the longest cavity, at 225 m, and also the deepest, at 109 m; it has been known since time immemorial, with clastic morphology and documented explorations since 1913. Other cavities notable for their length are Avenc de Coll Balaguer, at 115 m, and Avenc de les Codinetes, at 100 m. As for depth, after Avenc de Vandellòs come Avenc de Coll Balaguer, at 39 m, and Avenc de les Codinetes, at 33 m.

Among the deepest cavities there are also Avenc Júlia, at 25 m, and Avenc de les Forques, at 21 m. Cova del Llop Marí, with 48 m of length, is a sea cave with a large chamber, a zigzagging gallery and a lithogenic column.