Grotte di Rellinars

Rellinars, a municipality in Vallès Occidental, has 14 catalogued cavities: 7 pits and 7 caves. Together they total 330 m of passage and reach a maximum depth of 21 m. The recorded lithologies are conglomerates (12), travertines (1) and sandstones (1).

Among the cavities most notable for passage length are Avenc de la Barbotera, with 118 m, related to la Barbotera spring, in the Serra de l'Obac; Avenc Casas-martínez, with 40 m of passage and 19 m of depth in the torrent de la Cansalada, discovered on a family outing and surveyed on 21 September 2013; Avenc de l'Endaló, with 36 m of passage and 21 m of depth, with a triangular entrance of 2 x 0.7 m; Avenc dels Plans, with 27 m of passage and 15 m of depth; and Avenc de les Roquisses, with 20 m of passage and 7 m of depth, explored in January 1965 by GES – CMB.

As for depth, the deepest cavities are Avenc de l'Endaló (21 m), Avenc Casas-martínez (19 m), Avenc de la Barbotera (18 m), Avenc dels Plans (15 m) and la Pedregosa (9 m), an intermittent spring with 16 m of penetrable passage known since time immemorial and explored by GES – CMB in 1959 and by GE Badalona in 1976.