Grotte di Arnes

The municipality of Arnes, in the comarca of Terra Alta, has 12 inventoried cavities: 7 pits and 5 caves. The group reaches a total development of 601 m and a maximum depth of 52 m. The lithologies present are limestone, in 8 cavities, and conglomerate, in 4.

Avenc Pimpoll is the most notable cavity, both in terms of development, with 267 m, and depth, with 52 m; its lower level is 60 m long. Other relevant cavities are Avenc dels Científics, with 95 m of development and 38 m of depth, and Avenc de la Gana, with 75 m of development and 45 m of depth. Also listed are Avenc del Maquis, with 38 m of development and 20 m of depth, and Forat Nº2 de Coll de Montfort, with 35 m of development and 18 m of depth.

Several of these cavities were discovered in 1965 and rediscovered in 1978 by the SIRE – Tortosa; Forat Nº2 de Coll de Montfort was explored on 12 October 2013 by members of the Espeleo Club Tortosa.