Xemeneia Lateral del Grau de l'ós

From the Túnel del Cadí area, take a track that leads behind the toll booth. Here you must leave the car and continue on foot along the torrent; through a lower tunnel you pass to the other side of the road. Within a few metres you enter the barranc del Grau de l'Ós, which must be ascended. In the most gorge-like area, also known as Estret de Canals, the cave is found on the right-hand wall.