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:

  Spain 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, 2020, 2021,
  2022, 2023
  New England


 The Battle of
 El Mazuco

Name: Cueva Bolado (Las Herrerías, blacksmiths)

Location: 2.5km S of Llanes (3.5km by road).  From the Llanes–La Pareda road, turn left about 0.6km after crossing the main N634 road. After 100m or so, some 100m before a quarry entrance, there is a widening in the track, with lake to east, to park.  Go west over small stream (drain) and wooded path 50m to big walk-in cave entrance.

GPS: N43°24'00" W4°45'56"

UTM: 30T 357.14 4806.96

Map: Porrúa (32-III)

Survey: see »

Bolado/Herrerķa survey

Bolado/Herrerķa survey

(this also mentions the name ‘Bolao’ and suggests that that name refers to a different nearby cave).

Description: Easy walking cave with crystals, at the end. One side passage is gated off, presumably has paintings or other archaeological interest.


2004 – locate entrance

2004 – general explore

2005 – more photographs, etc.

2010 – tourist trip, physical; + dark adjustment experiment

2011 – UV torch tests

2012 – test 3W LED lights and surveying reflectors

2019 – general explore and discovered stream and resurgence

2021 – general explore and torch tests

2022 – test NEO3 light; photos, etc.

2023 – test UV-C (255nm) 4W torch



Crystal flow in Bolado

Crystal flow in Bolado

Bolado - modern art

Bolado - modern art

Cueva Bolado formations

Cueva Bolado formations

Expeditions to the Picos de Europa and elsewhere since 1973.
Please e-mail Mike Cowlishaw ( if you have any corrections, suggestions, etc.   See also the SpeleoTrove speleology section ».
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This page was last edited on 2023-04-14 by mfc.