Avenc de l'ú

Starting from the coll del Boix in the direction of the turó del Mal Pas de Puigdoure, we will leave the turnoff to the Hospital de Sang on our left. Further on we will also leave the spur that leads to the agulles de Matarrodona and the cova Bonica de l'Illa. We will take the next spur (spur 800, on the CET map, coincides with the figure 800 of the elevation mark) heading out on our left and following the line of the ridge. We will reach a cliff from where, directly below, we will see the Agulla Petita de Matarrodona. We will descend on our right, finding a worn gully in the forest. On the left hydrographic side of this gully, divided into two parts by a small promontory, is the avenc de l'Ú, at approximately the 767 metres elevation mark. We will find the entrance at the first division as we come, just after descending a few metres and sheltered in a block of conglomerate. Approximate coordinates.