Aven des Quatre

Aven des Quatre is a vertical karst chasm in the commune of Revest-des-Brousses, in the Alpes-de-Haute-Provence department, in the Vaucluse mountains of southern France. This is not a tourist site in the usual sense — there is no visitor infrastructure, and the chasm is known mainly within the caving community and among travelers drawn to Haute-Provence's wilder landscapes.

What is this place?

Aven des Quatre is a karst shaft cut into Aptian-age limestone (Early Cretaceous). The cave reaches a depth of roughly 200–205 meters, with a total passage length of about 250 meters. Its entrance sits at an altitude of around 780–790 meters, in a landscape typical of the Haute-Provence highlands — dry, rocky terrain covered with garrigue scrub.

The cave's name comes from its discoverers: on May 13, 1978, four members of the Speleo Club de Manosque descended the shaft and explored it to a depth of -56 meters. The following year, exploration continued under the school group (EDM) of Sainte-Tulle, led by André Languille. Further work pushed the known depth to -111 meters, and Jean-Paul Granier and André Languille of the Groupe Oraisonais de Recherches Souterraines crossed a tight, difficult passage later named the "Meander of Anguish." In 1980, a team including Pierre Bévengut and André Languille reached the terminal sump at -196 meters, which Languille free-dived without finding any further continuation.

How do you get there?

Revest-des-Brousses is a small commune in Alpes-de-Haute-Provence, close to larger towns such as Forcalquier and Banon. The cave entrance itself lies in mountainous terrain, away from marked hiking trails — reaching it requires local knowledge or a guide familiar with the area. There is no dedicated parking, signage, or visitor facilities on site.

What will you see?

Aven des Quatre is a technical caving site — a vertical shaft with a series of drops and narrow passages that require rope-climbing equipment (anchor points and ropes of varying lengths matched to individual pitches ranging from 8 to 40 meters). Descending to the bottom is not possible without proper caving experience, training, and gear. For anyone outside the speleology community, the cave itself remains inaccessible and hazardous.

The surface landscape around the entrance is classic Haute-Provence highland scenery — open ground, limestone outcrops, and Mediterranean scrub vegetation. It's a worthwhile stop for anyone interested in karst geology or the history of regional cave exploration who wants to see the terrain from the outside and understand the story behind the discovery.

When should you visit?

Spring and autumn offer the best conditions for exploring the area, when Provence's temperatures are mild and the ground isn't baked by summer heat. In summer, the dry, rocky terrain of Haute-Provence can get very hot, making longer approach hikes to the cave area uncomfortable.

Frequently asked questions

Can you visit Aven des Quatre without caving experience? No. This is a technical vertical cave requiring rope equipment and caving skills. Descending without proper training is dangerous.

How deep is the cave? The shaft reaches roughly 200–205 meters in depth, with passages totaling about 250 meters in length.

Who discovered Aven des Quatre? Four members of the Speleo Club de Manosque, on May 13, 1978 — which gave the cave its name.

Is there any tourist infrastructure nearby? No, the site has no parking, signage, or facilities. It's a destination for experienced cavers rather than a stop on a typical sightseeing route.