Grotte di Begues

Begues, a municipality in the Baix Llobregat, contains 198 inventoried cavities: 179 pits and 19 caves. Together they total 6980 m of passage and reach a maximum depth of 172 m. The dominant lithologies are limestones, with 176 cavities, followed by dolomites, with 22.

Avenc de la Ferla is the longest cavity, at 704 m, and also the deepest, at 172 m; it includes an entrance shaft of 92 m and several interior routes. It is followed in passage length by Avenc del Bruc, with 313 m and an entrance shaft of almost 5 m in diameter and 91 m vertical; Avenc Carles Selicke, with 300 m and a drop of about 135 m; Avenc de les Alzines, with 258 m and 34 m of depth; and Avenc del Boix, with 253 m and 27 m of depth, a 7 x 2.5 m entrance, a 6 m shaft and galleries discovered in 2014.

In depth, notable are Avenc de les Garses, with 146 m and a large doline 50 m in diameter and 7 m deep, and Avenc Nou de les Alzines, with 113 m, cleared and explored in the spring of 2010 down to the -19 level and, later, to the bottom of the Yu-Yui shaft at -61 m.