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Sistema del Cerro del Cuevon

WorldBlue  In short

The deepest cave in Spain and one of the deepest in the world is Cerro del Cuevon – a 1,589 m deep cave. This is an extremely complex cave for research and not accessible to common visitors.

3.9 out of 10 stars 38.5%

GPS coordinates
43.2211 N 4.858 W (approximately: the entrance in Torca del Cerro del Cuevon)
Location, address
Europe, Spain, Asturias, Cabrales municipality, in Parque Nacional de Los Picos de Europa
7,060 m (2017)
1,589 m

Map of the site

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WorldYellow In detail

Picos de Europa massif

The gorgeous Picos de Europa massif is a Carboniferous limestone massif with steep mountain peaks, up to 1.5 km deep gorges, numerous caves, and powerful springs.

In 2019 there were known 3 407 caves with a total explored length of 420 km in this massif (1.).

The deepest cave in Spain – a dangerous abyss

There are at least 14 very deep caves whose depth exceeds 1 kilometer, but the deepest is the system of two interconnected sinkholes named Sistema del Cerro del Cuevón. It is one of the most complex and dangerous caves in the world. The two sinkholes – entrances are:

  • Torca del Cerro del Cuevón (T33) – located at the height of 2,019 m. This is a deep well without much possibility to stop on rock ledges until its bottom.
  • Torca de las Saxifragas (TR-2) – less deep sinkhole, located at 43.2307 N 4.8621 W. Its entrance is at the height of 1,590 m.

The better-known entrance is Torca del Cerro del Cuevón – a small hole in the ground. As the speleologists descend into it, they should be prepared for relentless descent into numerous consecutive abysses with at least two nights spent while hanging in the air because there is no suitable location to rest on the ground. In total, the cave has more than 100 wells and the tallest is 135 m high.

Sistema del Cerro del Cuevón definitely is not a show cave: it is absolutely not suitable for mass tourism and it also does not have too many speleothems – stalactites, stalagmites, and other formations.

The cave system was formed mainly by underground rivers and the collapse of the cave ceiling above the voids that were formed by these currents. The largest stream in the cave is Rio Marbregalo with a flow of approximately 10 l/s.

It is possible that the water of this river reaches the surface at El Farfáu de la Viña spring in Garganta del Cares, 315 m above sea level.


Since 1990 the cave research in Picos de Europa massif is made by Interclub Espeleológico Valenciano with much involvement of Cocktail Picos (France).

These caving specialists put heroic effort into the research of Sistema del Cerro del Cuevón over several years until in the summer of 1998 they reached the present depth of 1,589 m.

This achievement has been extreme – another Spanish team reached the bottom of the cave in 2017 and speleologists recognized that this was an extremely complex caving expedition.



  1. G. Pomarada, Geólogos animan a abrir cuevas de Picos al turismo dada su buena conservación, El Comercio, 3 November 2019. Accessed on 10 April 2023.

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