Avenc Gran de la Portella

A first shaft of -3 metres allows access to a narrow, slightly descending gallery, which at one end connects with a vertical fissure down which 6 metres can be descended, to a point where it becomes impenetrable, although it has been sounded to -40 metres from this point. Continuing along the upper gallery, in the central part and below a second connection with the outside, also impenetrable, we find on a wall the entrance to a narrow descending crawl, followed by a ramp that reaches 15 metres, a point at which it also becomes impenetrable due to its narrowness; at this point it has been sounded to -30 metres.