Tresviso Caves Project

Tresviso Caves Project Gazetter



Area:Hoyo Oscuro
East, North:361059, 4784452 (nearby)
Coordinate Quality:GPS
Long, Lat:-4.710164841975, 43.200039342102 (map)
Elevation (m):2056
Length (m):35
Depth (m):-27
Active Lead:
Survey Available:


The Vegas de Andara (SARA Depression) at its head splits into three main cirques. From E to W, these are closest to the Collado San Carlos, the Vega del Hoyo Oscuru and that under the cliff wall between Castillo del Grajal, and Pico del Grajal de Abajo, (also called the Grajal Depression) From the Caseton de Andara take the track to the 'long cabana' past the hole in the spoil contouring on grass under Castillo del Grajal


Obvious long gash on E ridge above minor depression.


A NW end walk down to snow plug. Hole below subsidiary entrance drops between snow and rock for 10m to choke. At opposite end a 12m open shaft and duck under wall leads into main rift.

A short traverse ends in steeply sloping 15m pitch to snow and boulder choke.


L.U.S.S. (1986), LUSS 4
Tresviso 2022


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