Lago Ercina

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Site list (GPS fixes) Walks (GPS tracks)  Video clips Panoramas

Coordinates used

Electronic projects:

 Bat detector
 Lamp tests
 µ-controlled lamp
 SEPIC-based lamp
 ISP isolators
 Making SMT boards

Expedition logs:

 1973, 1974, 1975,
 1976, 1977, 1979,
 1982, 1983, 1985,
 1986, 1987, 1988,
 1989, 2000, 2001,
 2002, 2003, 2004,
 2005, 2006, 2007,
 2008, 2009, 2010,
 2011, 2012, 2013,
 2014, 2015, 2016,
 2017, 2018, 2019
 Mexico, New England


 The Battle of
 El Mazuco

Name: Cueva Gesaltza

Location: 4km almost due South of Oñati, near Santuario de Arantzazu

GPS: 100m W of N42°59'25" W2°25'15"

UTM: 100m W of 30T 547.33 4760.11

Description: Large entrace in 70m cliff leads to 200m of boulder-strewn gently descending passage to the top of a pitch. The pitch consisted of a possibly free-climbable 3m drop onto a landing followed by a further 5m drop (probably overhanging) to continuing dry streamway. The local landowner confirmed the name of the cave

2006 – to top of pitch.
2018 – unfriendly locals; moved on.

A farm with the name Gesaltza is marked on maps and is directly above the cave.

Expeditions to the Picos de Europa and elsewhere since 1973.
Please e-mail Mike Cowlishaw ( or Bill Collis (
if you have any corrections, suggestions, etc.   See also the SpeleoTrove speleology section ».
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This page was last edited on 2019-07-06 by mfc.