Grotte di Mura

Mura is a municipality in Bages that brings together 117 cavities: 76 caves and 41 pits. The whole sums 3418 m of passage and reaches a maximum depth of 123 m. The dominant lithologies are conglomerates (114 cavities), followed by sandstones (2) and travertines (1).

Among the longest cavities are the Cova-avenc del Picarol, with 340 m of passage in the Serra de l'Obac, an entrance shaft of 7.5 m and a system of galleries on three levels; the Avenc de l'Espluga, 123 m deep and about 320 m of passage, explored since 1953; and the Avenc del Llest, 56 m deep, with a large chamber and the Galeria Sardi. Also notable are the Coves de Mura, of 184 m, and the Cort Fosca de Matarrodona, of 125 m.

As for depth, in addition to the Avenc de l'Espluga (123 m), there are the Avenc del Llest (56 m), the Avenc de la Brega (52 m), the Avenc de Sant Jaume de la Mata (52 m), known since 1922, and the Avenc de Coll de Tanca (30 m), discovered on 16 May 2022, with an entrance one metre in diameter and a single shaft of 25 m.