Avenc de Vallmajor

The mouth measures 1 by 0.60 metres. It is a typical detachment fissure running NW-SE.

The mouth gives access to a first 6.5-metre pit. At its bottom and in a corner, a narrow opening gives access to a new 4-metre drop, followed by another 6.8-metre pit. The bottom of this second pit is a false gallery where the mouths of three pits open; all of them join a few metres further down. Descending through the pit situated furthest N, by means of a drop and a 4-metre pit, we reach a short gallery, at the end of which we progress about 3 metres along a fissure running E-W, perpendicular to the main fissure. Returning to this one, we continue descending down some ramps and small drops until reaching a very narrow passage that allows access to a 12-metre pit; its base is 20 metres wide and at its S end a new 5-metre pit opens through a narrow orifice. A couple more drops lead to the bottom of the cavity (elevation – 69.8 m).

Returning to the false gallery above, we now descend through the central pit, 12.2 metres, followed by two short drops, and we reach the bottom of this second route (elevation – 46.5 m).