Avencs dels Tres Grans - Xesc

The entrance, 0.80 metres wide by 5 metres high, gives way to a chamber 15 metres long by 5 metres above its base. From this chamber, through a descending gallery that leaves from its W wall, it connects with another one of wider proportions. This second chamber is rounded and about 10 metres in diameter, from which some short branches leave and in one of them there is a pit 8 metres deep half obstructed by debris and where the point of maximum drop is reached. It should be noted that in the ERE and EPE topography (1973) the 0 level is located at the highest point of the entrance, that is to say 6 metres above the entry point and for this reason a depth of 23 metres is attributed to it. On the other hand the connection with the avenc d'en Xesc, which is at a higher level, gives it a greater depth, being probably -23 metres the real level.

On the left of the entrance there is an open-air fissure; following it, one soon has to overcome a step about 3 metres high. Immediately afterwards we find a perpendicular fissure that has an exit at both ends; just crossing this fissure we find the pit giving access to the avenc d'en Xesc.

Like all the neighbouring cavities, the cavity is the product of the displacement of the limestone mass of the Penya Roja that has given rise to this whole series of interstitial cavities.