Above and to the right of Los Boyones resurgence (site 117), the cave entrance, discovered by boys from the village lies under the obvious track on the hillside at the base of a cliff. It is best located by first finding Cueva 77A (site 154) and then identifying a tree on the edge of the track, directly above it, as a land mark.

The entrance is an awkward climb into a small tube that soon leads to a junction. A daylight connection is seen near here. From the junction, a number of easily negotiable phreatic passage lead away but all apparently end at sand or calcite chokes. An inward draught seems to be present but is lost further in.

This cave comes very close to the high level passages in Cueva 77A (site 154).

References: anon., 1992b (logbook); material in file; Corrin J and Quin A, 1992; Corrin J, 1993
Entrance picture :
Underground picture(s):
Detailed Survey : 1:500
Line Survey :
On area survey :
Survex file : yes (Amended magnetic declination December 2013 to align with Eur79 grid and coordinates altered to fit ETRS89 datum, April 2014.)