Avenc de l'Obaga de l'illa

On the northern slope of the Carena de l'Illa, above the slope of the torrent de Matalonga.

Access can be gained from the house of l'Illa (les Arenes), from where a path leaves that runs along the whole of the carena and, on reaching a col (elevation 526 m), one must descend about 40 metres in a NNW direction.

One can also go by the track that leads to the Muronell sector and, when about to enter the Sot del Muronell, a path on the right climbs up towards the Carena de l'Illa.