Lago Ercina

Speleogroup  title


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


Sites of Speleogroup interest

Locations in the table below are usually at a point closest to the site where a GPS fix was possible; this point is sometimes ten or more metres from the site.  Locations are sorted West→East.  Click on a coordinate to see that coordinate on Google Maps.

The full list is also available in a single GPX file, generated from this page.

The first column (T) describes the ‘type’ of the site (experimental; may change) – this also sets the icon assigned to the site in the single GPX file:

B – historical/speleological Bar

C – cave (enterable)

K – karst feature (depressions, etc.)

P – point of interest (waypoint, landmark, parking places, rock shelter, etc.)

R – resurgence (no cave)

S – sink (no cave).

Coordinates are in °,′,″ (using the WGS84 datum) and UTM eastings and northings.  To convert coordinates to the European 1950 datum as used on most Spanish maps (including the 1:25,000 ‘blue series’), add 4.1″ to N and subtract 4.8″ from W (an adjustment of ~160m).  For more details on this and the grid systems used on the Spanish maps of the area, see Coordinate systems.

Altitudes shown with ‘?’ are suspect – uncalibrated altimeter or GPS.
T Coordinates Site
C N43°20'14" W5°54'29"
30T 264.28 4802.37
Cueva de las Caldas
S N43°17'56" W5°55'40"
30T 262.51 4798.16
Sumidoiru (La Mortera)
S N43°30'32" W5°29'36"
30T 298.56 4820.56
El Sumidoriu sink
C N43°13'15" W5°26'49"
30T 301.38 4788.45
Tarna Hydroelectric plant cave
C N43°10'41" W5°21'41"
30T 308.19 4783.50
Devoyu resurgence
C N43°10'41" W5°21'27"
30T 308.51 4783.49
Devoyu sink
C N43°26'47" W5°11'49"
30T 322.35 4812.93
Cueva del Sumidero/Agua
C N43°27'24" W5°06'23"
30T 329.70 4813.88
Cueva de les Pedroses
C N43°27'23" W5°06'22"
30T 329.71 4813.85
Cueva de les Pedroses sink (cave?)
C N43°20'12" W5°06'04"
30T 329.79 4800.55
Cueva La Huelga
C N43°26'12" W5°04'27"
30T 332.25 4811.62
Cuevona North Entrance
C N43°26'03" W5°04'20"
30T 332.39 4811.32
Cuevona South Entrance
C N43°27'39" W5°04'08"
30T 332.75 4814.28
Cueva del Tenis
C N43°27'39" W5°04'06"
30T 332.68 4814.07
Cueva del Tenis exit
C N43°18'29" W5°03'20"
30T 333.40 4797.28
Santa Cueva, in Covadonga
C N43°18'00" W5°03'14"
30T 333.51 4796.39
Cueva Orandi
R N43°18'13" W5°03'01"
30T 333.82 4796.78
Gueyu Reinazo resurgence
P N43°25'22" W5°02'53"
30T 334.32 4810.01
Santianes Molín de Arriba
C N43°17'55" W5°02'43"
30T 334.10 4796.01
Pozo Jaciosu (Trumbio lower entrance)
C N43°17'57" W5°02'42"
30T 334.13 4796.08
Small cave, near Trumbio lower entrance
K N43°17'56" W5°02'40"
30T 334.17 4796.03
Trumbio lower entrance (est. from survey)
C N43°25'46" W5°02'15"
30T 335.20 4810.73
K N43°23'56" W5°02'05"
30T 335.34 4807.33
La Mujerina area big depression
K N43°25'28" W5°01'58"
30T 335.56 4810.17
Tinganón feeder’ (337m)
C N43°17'43" W5°01'56"
30T 335.26 4795.82
P N43°26'02" W5°01'08"
30T 336.71 4811.19
The ‘Polígono hole’, 250m above Polígono Guadamia
P N43°26'12" W5°00'59"
30T 336.91 4811.49
Below possible Cueva Negra old resurgence
C N43°25'21" W5°00'27"
30T 337.60 4809.90
Cueva Negra (455m)
R N43°26'02" W5°00'18"
30T 337.84 4811.16
Madre del Río
K N43°27'31" W4°59'26"
30T 338.97 4813.66
Pozu Tuerba + Sea Arch
B N43°16'19" W4°58'57"
30T 339.22 4793.13
Lago Ercina Bar María Rosa
P N43°16'18" W4°58'57"
30T 339.23 4793.10
Lago Ercina carpark
K N43°15'36" W4°58'44"
30T 339.49 4791.80
Forcau route possible caves at +1235m
C N43°15'27" W4°58'28"
30T 339.85 4791.51
Forcau route vertical cave at +1306m
K N43°16'51" W4°58'43"
30T 339.57 4794.11
Lago Ercina cow-shelters
K N43°27'40" W4°58'24"
30T 340.46 4814.11
Pozo de las Grallas, Bufones de Pría (41m)
P N43°14'57" W4°57'59"
30T 340.47 4790.57
Forcau col
C N43°14'52" W4°58'03"
30T 340.39 4790.42
Pozu de Vega El Forcau, +1480m, reconfirmed 2011
S N43°24'52" W4°57'55"
30T 341.00 4808.94
Llamigo sink
C N43°19'32" W4°57'27"
30T 341.40 4799.05
El Peruyal, near Benia – shown on the map as Cueva Pruneda
K N43°19'52" W4°56'39"
30T 342.49 4799.64
Avín depression
S N43°21'53" W4°56'38"
30T 342.59 4803.37
Vega de Hibeo sink
P N43°19'13" W4°55'07"
30T 344.42 4798.17
Minas de Alda
C N43°19'31" W4°55'07"
30T 344.55 4798.93
Cueva Tayada (Cueva Alda), 450m?
C N43°21'38" W4°54'53"
30T 344.96 4802.85
“Cueva Geoffo” (Cosagra), 190m
S N43°24'53" W4°54'43"
30T 345.32 4808.85
Vizcaina/L’Acebal sink, 119m?
K N43°24'43" W4°54'31"
30T 345.47 4808.32
Jou de Cuanda
P N43°24'44" W4°54'22"
30T 345.67 4808.35
Collado los Cuervos
C N43°20'03" W4°54'12"
30T 345.81 4799.89
Cueva Dobros (Depression N of Ortiguero)
B N43°26'33" W4°54'16"
30T 346.00 4811.93
Bar La Cueva, Villahormes
R N43°12'47" W4°54'09"
30T 345.57 4786.44
Resurgences at Caín, 473m?
P N43°24'37" W4°54'10"
30T 346.05 4808.34
Rales System car parking for Molino
K N43°23'14" W4°53'50"
30T 346.43 4805.78
Rotella large depression cave
P N43°24'40" W4°53'45"
30T 346.60 4808.43
Saddle between Rales and Fuentica
C N43°24'39" W4°53'44"
30T 346.64 4808.39
Rales System
K N43°26'51" W4°53'10"
30T 347.50 4812.46
Playa Gulpiyuri
C N43°19'04" W4°52'30"
30T 348.07 4798.02
Flea cave, +287m
C N43°22'44" W4°51'58"
30T 348.94 4804.80
Caldueñín, 140 m
P N43°20'57" W4°51'26"
30T 349.59 4801.47
Tebrandi trailhead, ~770m
C N43°22'44" W4°51'20"
30T 349.79 4804.77
Pozo de Fresno »
P N43°23'00" W4°51'11"
30T 350.01 4805.26
El Mazuco, Ermita del Santo Ángel (confirmed ±0.5″ over several years and devices)
P N43°22'42" W4°51'05"
30T 350.12 4804.70
‘Car paddock’ parking for Boriza/Fresno
C N43°22'48" W4°50'59"
30T 350.17 4804.67
Cueva de Bolugo
R N43°24'43" W4°50'54"
30T 350.46 4808.43
Resurgence below Green Sink
P N43°22'40" W4°50'35"
30T 350.80 4804.64
Old resurgence? above Boriza
P N43°22'39" W4°50'35"
30T 350.80 4804.58
Hole next to track immediately above Boriza
P N43°22'38" W4°50'35"
30T 350.81 4804.56
Boriza (track above and to S.)
R N43°22'43" W4°50'36"
30T 350.68 4804.50
Boriza resurgences 2019
S N43°22'40" W4°50'27"
30T 350.99 4804.62
Flood sink above Boriza
K N43°22'38" W4°50'20"
30T 351.13 4804.56
Boriza stream audible through rocks
C N43°23'56" W4°50'18"
30T 351.24 4806.96
Green Sink cave (above and to S. of sink)
R N43°22'29" W4°50'02"
30T 351.54 4804.27
Ojo del Río Bolugas
C N43°22'31" W4°49'58"
30T 351.64 4804.35
Cueva a Sul
C N43°22'25" W4°49'58"
30T 351.63 4804.14
Cueva de Collau Rubiera
P N43°22'51" W4°49'38"
30T 352.10 4804.94
End of the road S. of Alto de la Tornería
P N43°22'44" W4°49'22"
30T 352.46 4804.73
Rafa’s Cabaña
R N43°22'14" W4°47'40"
30T 354.73 4803.74
Spring at west end of Viango
C N43°22'10" W4°47'12"
30T 355.36 4803.60
Cueva de la Yosa del Viango
P N43°10'07" W4°47'09"
30T 354.95 4781.29
Refugio de Áliva (1666m)
K N43°22'28" W4°46'41"
30T 356.06 4804.14
Dry stream valley, NE Viango
K N43°12'16" W4°46'27"
30T 355.98 4785.25
‘Cow shelter’ caves, nr. road to Áliva
B N43°24'05" W4°46'20"
30T 356.60 4807.12
Bar La Roxia at La Pareda
C N43°24'00" W4°45'56"
30T 357.14 4806.96
Cueva Bolado (Herrería)
K N43°14'24" W4°44'16"
30T 358.91 4788.95
Arch/shelter near Sotres TV mast
K N43°14'22" W4°44'14"
30T 358.96 4788.87
Arch near Sotres TV mast – reckoned from photo bearings
P N43°14'14" W4°44'10"
30T 359.03 4788.63
Sotres telecoms mast
C N43°22'22" W4°44'13"
30T 359.39 4803.89
Fuente Grande, near Viango
S N43°14'06" W4°43'27"
30T 360.11 4788.56
Sink 3km E of Sotres (1277m?)
C N43°14'09" W4°43'25"
30T 360.16 4788.65
Shaft 3km E of Sotres (1276m?)
C N43°24'54" W4°43'16"
30T 360.66 4808.33
Bufones de Ballota – sea cave with stream entering
C N43°22'35" W4°43'18"
30T 360.64 4804.26
El Cuevón de Pruneda (Purón cave)
K N43°22'07" W4°42'53"
30T 361.18 4803.39
Holly depression above Las Conchas
K N43°14'21" W4°42'45"
30T 361.07 4789.01
Sotres crossroads depression
C N43°15'16" W4°42'14"
30T 361.81 4790.69
Cueva de la Marniosa
R N43°22'18" W4°41'49"
30T 362.64 4803.68
Nacimiento de Río Purón
R N43°15'19" W4°41'47"
30T 362.41 4790.77
Valle de Sobra resurgence and cheese cave (849m?)
C N43°15'19" W4°41'44"
30T 362.48 4790.77
Valle de Sobra abandoned cheese cave (15m E)
C N43°14'47" W4°40'29"
30T 364.15 4789.75
Cueva del Nacimiento/Agua
P N43°19'39" W4°40'22"
30T 364.49 4798.74
‘Cobalt’ mines, Río Cares
C N43°16'27" W4°40'19"
30T 364.44 4792.83
Cueva de Los Jarres, San Esteban
K N43°21'44" W4°40'03"
30T 364.99 4802.60
La Borbolla top depression
K N43°21'46" W4°39'58"
30T 365.11 4802.66
La Borbolla middle depression (El Jorcón)
K N43°21'47" W4°39'12"
30T 366.14 4802.67
La Borbolla lower depression
C N43°19'57" W4°38'46"
30T 366.65 4799.26
Cueva Llonín
C N43°14'21" W4°38'37"
30T 366.65 4788.90
Cueva la Sotorraña (as shown on survey/board)
C N43°23'39" W4°38'33"
30T 367.09 4806.11
Pendules shelters
P N43°14'49" W4°38'29"
30T 366.86 4789.75
Bejes Puente Pumpedrei #1
P N43°14'47" W4°38'31"
30T 366.82 4789.68
Bejes Puente Pumpedrei #2
C N43°16'28" W4°38'06"
30T 367.44 4792.80
Pozo del Infierno (310m)
P N43°21'56" W4°38'05"
30T 367.66 4802.92
La Borbolla village
R N43°21'50" W4°38'02"
30T 367.73 4802.73
La Borbolla resurgence
C N43°16'02" W4°38'01"
30T 367.54 4791.98
Urdón cave (estimate; GPS impossible)
C N43°23'42" W4°36'37"
30T 369.71 4806.16
Cobijeru 2 muddy cave
C N43°23'41" W4°36'36"
30T 369.72 4806.10
Cobijeru 1 resurgence
C N43°23'47" W4°36'35"
30T 369.76 4806.29
Cobijeru 3 – sea cave
R N43°18'35" W4°36'31"
30T 369.66 4796.68
Vauclusian spring (Deva gorge, between Estragüeña and Puentelles)
R N43°15'09" W4°36'30"
30T 369.55 4790.32
La Hermida hot spring
R N43°17'59" W4°36'24"
30T 369.79 4795.56
Fuente de Estragüeña, 110m
C N43°23'23" W4°34'50"
30T 372.00 4805.30
Cueva Mazacuíos, La Franca
C N43°18'06" W4°35'39"
30T 370.81 4795.76
Goat Cave through trip
C N43°18'06" W4°35'37"
30T 370.84 4795.77
Crow Cave with pitch
K N43°18'04" W4°35'36"
30T 370.88 4795.71
“El Arco”
C N43°18'03" W4°35'35"
30T 370.88 4795.67
Cueva del Arco (480m)
C N43°12'17" W4°35'36"
30T 370.66 4785.00
Cueva de Fair Share (BUSS 1973; 215m)
P N43°18'15" W4°35'39"
30T 370.71 4795.83
‘The barn’ near Suarías, near Al Arco
S N43°18'14" W4°35'31"
30T 370.88 4795.81
Sink with boulders near Al Arco barn, Suarías
R N43°19'10" W4°35'19"
30T 371.19 4797.53
Likely resurgence for Suarías Cueva La Redonda
C N43°18'50" W4°35'15"
30T 371.37 4797.10
Cueva La Redonda (Suarías) (161m)
S N43°18'01" W4°34'53"
30T 371.84 4795.59
Sink in boulders in big depression above Suarías (Corvera)
K N43°20'59" W4°34'46"
30T 372.10 4801.07
Andinas westernmost (highest) depression
K N43°14'08" W4°34'31"
30T 372.21 4788.39
Riega de Cicera ‘pothole in the wall’
R N43°17'54" W4°34'22"
30T 372.53 4795.37
Suarías Corvera resurgence
C N43°18'08" W4°34'18"
30T 372.63 4795.78
Cabañuca, 305m
R N43°18'20" W4°34'16"
30T 372.69 4796.15
Cabañuca resurgence, 208m?
C N43°19'53" W4°33'34"
30T 373.68 4799.01
Cueva La Loja
P N43°19'18" W4°33'14"
30T 374.10 4797.93
Track to 1973 cave(?), near Morodio (2015 »)
S N43°19'56" W4°33'30"
30T 373.78 4799.10
Andinas bottom sink
K N43°19'42" W4°31'16"
30T 376.78 4798.61
Canto Grande depressions, Cabanzón
C N43°19'04" W4°30'42"
30T 377.53 4797.44
Cueva de Casamaría (2015 »)
P N43°17'00" W4°30'23"
30T 377.88 4793.59
Saddle above Cororigo resurgence (2015 »)
P N43°20'12" W4°29'50"
30T 378.74 4799.49
Cofría resurgence rift parking (nr. Sobanejo)
R N43°20'22" W4°29'21"
30T 379.40 4799.81
Cofría resurgence rift 2009 & 2010
C N43°18'27" W4°29'17"
30T 379.41 4796.24
Cueva Las Brujas (~170m)
C N43°20'25" W4°29'07"
30T 379.72 4799.87
Cofría sinks (Regato Mata del Tocial)
S N43°16'49" W4°29'13"
30T 379.46 4793.22
Cueva Toyu river sink
K N43°16'53" W4°29'13"
30T 379.47 4793.35
Cueva Toyu ‘nettle feature’
C N43°16'55" W4°29'09"
30T 379.54 4793.41
Cueva Toyu NW ‘torca’ entrance
P N43°16'56" W4°29'08"
30T 379.57 4793.42
Cueva Toyu old barn NE corner (203m)
C N43°16'54" W4°29'04"
30T 379.66 4793.39
Cueva Toyu NE ‘Roza’ entrance
C N43°16'59" W4°29'03"
30T 379.70 4793.53
Cueva Rozada, near Cueva Toyu
P N43°16'55" W4°28'59"
30T 379.77 4793.41
Cueva Toyu resurgence
C N43°16'44" W4°28'58"
30T 379.79 4793.07
Cueva de los Marranos »
C N43°16'44" W4°28'57"
30T 379.82 4793.07
Cave 68
C N43°23'47" W4°25'14"
30T 384.96 4805.81
Cueva del Cuélebre
R N43°15'27" W4°16'01"
30T 397.17 4790.19
La Fuentona, Ruente
C N43°20'29" W4°14'11"
30T 399.88 4799.68
Cobijón cave
P N43°20'27" W4°14'11"
30T 399.90 4799.62
Cobijón – river, close to cave
S N43°04'44" W4°14'09"
30T 399.52 4770.52
Sink at at Venta de Tajahierro
K N43°20'20" W4°12'46"
30T 401.81 4799.38
Bustablado depression cliff
R N43°11'34" W3°35'02"
30T 452.56 4782.38
Nacimiento del Gándara
C N43°12'23" W3°34'21"
30T 453.50 4783.89
Torca del Mortero de Astrana
C N43°14'02" W3°34'00"
30T 454.00 4786.95
Garma Ciega
K N43°15'18" W3°33'12"
30T 455.09 4789.27
Hoyo Masallo
S N43°20'36" W3°42'20"
30T 442.81 4799.18
El Coladillo sink (close to La Cavada, SSE of Solares)
R N43°15'05" W3°36'23"
30T 450.89 4789.12
Puente Cubera resurgence, Asón (~200m)
C N43°20'22" W3°22'09"
30T 470.18 4798.78
Cueva Los Tocinos
C N43°20'14" W3°21'55"
30T 470.49 4798.54
10m SE of small cave above Hoya Mena sink
S N43°20'15" W3°21'54"
30T 470.51 4798.56
Hoya Mena sink
S N43°23'58" W3°21'31"
30T 471.08 4805.46
Hazas sink
R N43°23'47" W3°19'44"
30T 473.47 4805.11
Oriñón resurgence
C N43°21'41" W3°16'37"
30T 477.67 4801.20
Cubilla (192m)
P N43°21'45" W3°16'34"
30T 477.74 4801.32
Parking above Cubilla
C N43°21'34" W3°15'22"
30T 479.36 4800.97
Cueva Lastrilla (98m?)
P N43°21'37" W3°14'52"
30T 480.03 4801.06
Turn-off to Cueva Lastrilla
P N43°06'56" W2°40'05"
30T 527.12 4773.91
Parque Natural de Urkiola
C N43°07'16" W2°43'31"
30T 522.46 4774.51
La Cueva de Balzola (308m)
C N42°59'25" W2°25'15"
30T 547.33 4760.11
Cueva Gesaltza

 †  Location estimated from map or other source (all other coordinates are GPS readings).

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 2023-04-13 by mfc.