Avenc de Coll Estret

A 32 m deep pit in Olesa de Bonesvalls, with a very narrow entrance, a small shaft of almost 4 metres and a main shaft of 28 metres.

Olesa de Bonesvalls • Alt Penedès 40m 32m

EspeleoWorld

A 32 m deep pit in Olesa de Bonesvalls, with a very narrow entrance, a small shaft of almost 4 metres and a main shaft of 28 metres.

Olesa de Bonesvalls · Alt Penedès

Length: 40 m · Depth: 32 m

Updated record

https://espeleoworld.com/en/c/avenc-de-coll-estret

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 32 m deep pit in Olesa de Bonesvalls, with a very narrow entrance, a small shaft of almost 4 metres and a main shaft of 28 metres.

Characteristics

Type: Pothole
Municipality: Olesa de Bonesvalls
Region: Alt Penedès
Unit: Garraf, el
Length: 40 meters
Depth: 32 meters
Major Unit: Serralada Litoral
Lithology: Limestone
Updated on EspeleoÍndex: November 17, 2012

Location

From the barri de l'Hospital in Olesa de Bonesvalls you must go to the municipal sewage treatment plant; the track continues along the side of the riera de Begues and very often crosses it. After a little more than 2 kilometres, the riera makes a turn of almost 360º, forming a narrow section of the surrounding massif (coll Estret). On the S slope of this coll, some 20 metres above the riera, is the small entrance of the pit.

Entrances

Always verify coordinates and access conditions before setting out.

Coll Estret, Avenc de
Elevation: 237 m
41.339110, 1.824270
UTM 31T (ED 50) 401722 4577273
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Topographic

Avenc de Coll Estret - Topography, Olesa de Bonesvalls, Alt Penedès

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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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Photos

Avenc de Coll Estret - Photo, Olesa de Bonesvalls, Alt Penedès

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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

Very narrow entrance through which one enters a small shaft of almost 4 metres. Immediately after, the main shaft of the cavity begins, of 28 metres. The first section is slightly subvertical and widens as depth is gained.

History

The first exploration of the cavity was carried out in January 1960 by members of the GES – CMB.

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Bibliography

Borràs, J. (1974).- Catálogo espeleológico del macizo de Garraf. Vol. III . 207 pp. Barcelona.
Ferrer, V. (2006).- Avencs de Garraf i d'Ordal. 152 pp. + llibret fitxes i topografies. Edició de l'autor. Barcelona.