Grotte della Montsià

Montsià has 97 catalogued cavities: 75 caves and 22 pits. Together they total 3000 m of length and reach a maximum depth of 99 m. By lithology, limestone predominates (92), followed by dolomite (4) and conglomerate (1). The region has 9 child units.

Cova Trobada is the longest cavity, at 360 m, and also the deepest, at 99 m. It is followed by l'Entronador, with 302 m of length and 84 m of vertical drop, and Cova Uf-2, with 270 m of length and 62 m of depth. Other cavities notable for their length are Cova del Tendo (202 m) and Avenc de Maçana (150 m).

Among the deepest cavities are Avenc de la Canal de l'avenc (63 m) and Forat Tx-2 (60 m). Cova Trobada, known since ancient times, was explored by the SIE in 1974 and 1976 and surveyed in 2021; Cova Uf-2 was discovered and explored by the Espeleo Club Tortosa in the first days of January 1983.