Grotte di La Sénia

The municipality of la Sénia, in Montsià, has 14 catalogued cavities: 5 pits and 9 caves. Together they total 1289 m of passage and reach a maximum depth of 99 m. The lithologies represented are limestone, present in 10 cavities, and dolomite, in 4.

Among the most significant cavities is the Cova Trobada, with 360 m of passage and 99 m of depth, known since ancient times, explored by the SIE in 1974 and 1976 and surveyed in 2021. l'Entronador (FF-1) is a temporary spring with 84 m of vertical drop in the barranc de la Fou (el Port), with a terminal sump partially explored. The Cova Uf-2, in el Port, has 270 m of passage and 62 m of depth, and was discovered and explored by the Espeleo Club Tortosa in the first days of January 1983.

Other cavities are the Avenc de Maçana, 40 m deep with a large chamber in el Port, explored in 1983 and resurveyed in 2010, and the Forat Tx-2, about 60 m of vertical drop, near the font del Teix, discovered and explored in 1994 by the Espeleo Club Tortosa.