Avenc de la Brega

A 52 m deep pit in the Serra de l'Obac, with a circular entrance just over one metre in diameter and a single shaft.

Mura • Bages 60m 52m

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Avenc de la Brega

A 52 m deep pit in the Serra de l'Obac, with a circular entrance just over one metre in diameter and a single shaft.

Mura · Bages

Length: 60 m · Depth: 52 m

Updated record

https://espeleoworld.com/en/c/avenc-de-la-brega

Information can change. Always verify coordinates, access, weather, and cave conditions before setting out.

Topographic map of the main entrance — Main entrance · ICGC topographic map

A 52 m deep pit in the Serra de l'Obac, with a circular entrance just over one metre in diameter and a single shaft.

Characteristics

Type: Pothole
Municipality: Mura
Region: Bages
Unit: Obac, Serra de l'
Length: 60 meters
Depth: 52 meters
Major Unit: Serralada Prelitoral
Lithology: Conglomerate
Updated on EspeleoÍndex: November 17, 2012

Location

From the house of la Mata, near the coll d'Estenalles, take the path in a SW direction to the coll de Garganta. From here, in a N direction, a path sets out that soon brings us to the Font Freda and continues following the whole left slope of the torrent of the same name. One reaches a fork and must follow the left one (the right one goes towards the bottom of the torrent); before crossing the torrent de la Castanyera we will find the Avenc del Tortosí and following the path, once past the aforementioned torrent, there is a flat area from which a small path sets out to the left that in a few metres brings us to the Avenc de la Brega. One of the old pit signposting signs is still preserved, indicating the possible presence of gases.

Approximate coordinates.

Entrances

Always verify coordinates and access conditions before setting out.

Avenc de la Brega
Elevation: 725 m
41.672264, 1.980933
UTM 31T (ED 50) 415265 4614095
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Topographic

Avenc de la Brega - Topography, Mura, Bages

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Espeleoindex · CC BY-NC 4.0, https://creativecommons.org/licenses/by-nc/4.0/ · Image © its author.

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Description

Morphology

A circular entrance just over one metre in diameter communicates with a single shaft, narrow in the first metres, 52 metres deep. Along its course it presents a maximum width of about 2 metres and the megaclase that generates the cavity in a few points goes a little beyond 5 metres in length. The base of the shaft is the classic debris cone of small-sized clastic materials.

History

We do not know who or when the first exploration was made. The oldest news we have is the visit by members of the GES-CMB in June 1954 and they surveyed it.

In 1970 members of the Espeleo Club de Sabadell made a new survey calculating 3 metres more depth (55 m.) than the one made by the GES (52 m.)

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Bibliography

Andrés, O. (1964).- “ Karstificación en conglomerados. Su estudio en el macizo de St. Llorenç del Munt – Serra de l'Obac (Barcelona)”. Geo y Bio Karst (2): 9-16. Ed. J.Mª Armengou. Barcelona.

Comas, M. (1970).- “Arxiu espeleològic de l'Espeleo-Club Sabadell: Avenc de la Brega”. Espeleo Club (1): 8-9. ECS de la Unió Excursionista de Sabadell.