Grotte di Tortosa

Tortosa, a municipality in the Baix Ebre, contains 42 inventoried cavities: 33 pits and 9 caves. The group totals 4,799 metres of passage and reaches a maximum depth of 167 metres. The lithologies present are dolomite, with 23 cavities, and limestone, with 19.

Among the most significant cavities are the Avenc dels Mamelons, 167 metres deep at the Mola de Catí (el Port, Tortosa), with an estimated total passage of 700 metres and several internal routes, and the Avenc de la Crisi, 148 metres deep, with the largest vertical drop in Catalonia, el Port (Tortosa), and 1,215 metres of passage. Other notable cavities are the Cova del Garrofer, about 400 metres of passage, with the Galeries Velles and the Galeries Noves; the Cova Cambra, about 300 metres, in the very middle of the Mola de Catí; and the Avenc del Polit, 139 metres deep at the Mola de Catí, discovered on 18 July 2010.

Also listed are the Avenc de Farrubio, 106 metres deep in the El Port massif, E of the summit of Farrubio (791 m), and the Avenc de la Tronada, 86 metres deep at the Mola de Catí, with an entrance gallery, gours and shafts of 26, 47 and 14 m, discovered in 1958 by the GES-CMB.