Abîme de Saint-Ferréol

Abîme de Saint-Ferréol is a striking karst chasm (aven) on the edge of the Causse de Campestre, a limestone plateau within the wider Causse de Blandas karst region on the fringe of the Cévennes, in the commune of Campestre-et-Luc in the Gard department of southern France. The shaft sits along the route between Alzon and La Couvertoirade and has long drawn cavers and lovers of the region's dramatic karst scenery.

How deep is the chasm and what does the inside look like?

The main vertical drop from the old winch rim measures roughly 45 metres, while the cave's total depth reaches somewhere around 70 to 80 metres. At the bottom, the shaft opens into a broad chamber, dimly lit by daylight filtering down from above, its floor covered in fallen rock debris. Calcite flowstone coats parts of the walls, but there are no true stalactites or stalagmites here — the character of the place is raw and cavernous, typical of the large avens found across this limestone plateau.

Why is this cave linked to Roquefort cheese?

Between 1883 and 1929, the chasm served an unusual industrial purpose: it was used as a natural cellar for ripening Roquefort cheese. The steady cool temperature and humidity deep underground made it ideal for ageing wheels of cheese, which were lowered to the chamber floor using a wooden winch built at the rim in 1882. Remnants of the stone winch house still stand at the entrance today.

What is the man-made tunnel that leads inside?

To avoid the slow process of winching cheese up and down, workers later cut an artificial tunnel roughly 200 metres long through solid rock, connecting a nearby doline to the underground chamber. The passage descends at a gentle slope and ends at a wooden door opening directly into the chasm. The digging of this tunnel is tied to a former juvenile penal institution that once stood nearby on the Causse de Campestre — a facility that operated first as an agricultural penal colony for young offenders (1856–1904) and later as an agricultural school for troubled youths under public welfare care (1904–1929). Young inmates from that institution are believed to have carried out much of the tunnelling work.

Can visitors go inside the Abîme de Saint-Ferréol today?

The site sits on private land, and descending it calls for genuine caving skill and equipment — the old, corroded winch parts are no longer safe to use, so modern visits rely on bolted anchors and ropes instead. Because of the risk of collapse in both the access tunnel and the chamber ceiling, the site is considered hazardous and best approached with experienced local cavers or through an organised speleology outing, of the kind run by clubs in the Gard and Aveyron area.

Frequently asked questions

Where exactly is Abîme de Saint-Ferréol located? In the commune of Campestre-et-Luc (Gard), on the Causse de Campestre plateau, within the broader Causse de Blandas and Cévennes karst region, between Alzon and La Couvertoirade.

How deep is the chasm? Total depth is around 70 to 80 metres, with the main vertical shaft from the old winch rim measuring about 45 metres.

What was the cave used for historically? From 1883 to 1929 it served as an underground cellar for ripening Roquefort cheese, using a wooden winch installed in 1882 and, later, an access tunnel.

Is it safe to explore on your own? No — the land is private and the descent is dangerous due to collapse risk. Visiting requires caving experience and proper gear, ideally alongside a local caving club.

Are there stalactites or stalagmites inside? No classic dripstone formations are found here — only calcite flowstone on the walls — and the interior reads more as one large open rock chamber than a decorated cave.