Grotte e abissi nell'unità geologica Costa del Tarragonès - Cap de Salou

The Costa del Tarragonès - Cap de Salou unit, within the Serralada Prelitoral, comprises 41 cavities: 35 caves and 6 pits. The total inventoried passage is 3428 m and the maximum depth reached is 58 m. Limestone predominates (39 cavities), with the presence of Dolomite (2).

The most notable cavity is the Cova Urbana de Tarragona, with 2441 m of passage and 58 m of depth, discovered by chance in 1996 during the construction of a car park on carrer del Gasòmetre, no. 32. Other notable cavities are the Coves del Lladre (92 m), the Avenc I Cova de la Cala de la Móra (55 m, with a 19.72 m shaft), the Foradades de la Jovera (54 m) and the Pou de l'Encantament (47 m, 28 m of depth, explored by the SIE del CE Àliga in the summer of 1973 and surveyed on 20 January 1974).

The coastal limestone reliefs of the Tarragonès include small caves open by the sea, such as the Avenc d'en Campos (10 m of depth) at Tamarit, which communicates with a cave open to the sea, or the Avenc Petit de l'Encantament (16 m of depth, with a practicable depth of -16.5 m) at Altafulla.