The Gouls de Tourne: the bottomless abyss of Bourg-Saint-Andéol

In the very heart of Bourg-Saint-Andéol, there is a place most passers-by walk past without imagining what it hides. On the surface: a peaceful basin of clear water in a park, an old wash-house, an ancient bas-relief. Below: a dizzying abyss, a labyrinth of flooded galleries plunging more than 240 metres deep, and whose bottom has never been found. These are the Gouls de Tourne, one of the world’s greatest cave-diving sites — and it lies five minutes from Mas Saint Antoine. Here is its story.

What are the Gouls de Tourne?

The Gouls de Tourne (locals simply say “Tourne”) are two neighbouring resurgences, located in a park in the centre of Bourg-Saint-Andéol, about a hundred metres apart: the Goul du Pont and the Goul de la Tannerie.

The word “goul” refers here to a Vauclusian-type resurgence: not a simple spring, but the place where an underground river reappears in the open air. Beneath the calm surface lies a whole network of flooded galleries, carved by water into the limestone over millennia — a karst system whose limits have, to this day, still not been reached.

Why is this site known around the world?

The Gouls de Tourne are a world reference for deep cave diving. There are several reasons for this.

First, a striking paradox: a site of extreme difficulty, but with surprisingly easy access. You park in the town-centre park, and the water entry is a few steps away. This accessibility has made it a true “training site” for cave diving, where many specialised divers are trained.

Then, two cavities with complementary profiles: the Goul du Pont, with a shallow horizontal progression followed by a vertical shaft; and the Goul de la Tannerie, about 700 metres of horizontal gallery leading to a dizzying shaft. Each exceeds a kilometre in length and 200 metres in depth — and, remarkably, the two systems have to this day still not joined up.

Forty years of world records

The Goul de la Tannerie is one of the world’s great sites for deep cave diving. For more than forty years, the world’s leading cave divers have pushed the depth limits there. A few milestones in this dizzying race:

• 1983 — Bertrand Léger reaches -113 m and draws the first detailed survey.
• 1996 — Olivier Isler descends to -165 m.
• 2004 — Sylvain Redoutey reaches -209 m, the European record of the time.
• 2008 — Britain’s Rick Stanton pushes to -220 m.
• 2014 — Xavier Méniscus reaches -240 m.
• 2019 — Xavier Méniscus goes even deeper, to -243 m.

To grasp the feat: in 2014, to reach -240 metres nearly 1.5 km from the entrance, Xavier Méniscus stayed underwater for more than ten hours. A former combat swimmer and professional diver, he has become the emblematic figure of the site, which he has been exploring since 2002.

Far more than a sporting feat: the town’s water

What makes the Gouls de Tourne even more fascinating is that these explorations have a purpose beyond the record. The work carried out on the site aims in particular to map this huge underground network in order to protect the water resource — because these resurgences actually supply Bourg-Saint-Andéol with drinking water. Searching for the junction between the two gouls, understanding where the water comes from and how it flows: it is also a mission in the service of the town and its future.

Can you dive in the Gouls de Tourne?

Let us be clear: this is not a leisure dive. Deep cave diving is one of the most demanding and committing disciplines there is, reserved for highly specialised and extensively trained divers. It is not an activity accessible to holidaymakers.

Moreover, because of the protection of the drinking-water resource, diving on the site is regulated and subject to a prefectoral order. Before any project, it is essential to check the regulations in force with the competent authorities or the local diving club (the Club de Plongée du Val de Tourne).

But good news: there is no need to dive to enjoy the place. The site is very easy to discover from the surface, and that is what we recommend to our guests.

What is there to see on the surface?

The Tourne valley has been classified as a picturesque site since 1934, and it is worth the walk in itself. On site, you will discover:

• The two basins of clear water of the resurgences, in their green setting — calm on the surface, dizzying below.
• An antique-inspired wash-house, fed by the springs.
• A rare bas-relief dedicated to the god Mithras, one of very few in France — a testimony to the Gallo-Roman past of Bourg-Saint-Andéol.

It is a perfect stop, free and shaded, to combine with a visit to the old town of Bourg-Saint-Andéol and its medieval lanes.

A site five minutes from Mas Saint Antoine

This is the whole appeal for our guests: this exceptional site is only five minutes from Mas Saint Antoine. Whether you are passionate about geology, fond of unusual stories, curious about heritage or simply looking for a pleasant walk, the Gouls de Tourne are a memorable discovery. Imagining that a few metres beneath your feet plunges an abyss whose bottom is unknown has something genuinely fascinating about it.

During your stay, you can continue with the area’s other treasures: the Ardèche gorges, the Chauvet 2 Cave, or the markets of southern Ardèche. Find our accommodations on the our cottages in the Ardèche page.

In conclusion

1. The Gouls de Tourne are two resurgences in the centre of Bourg-Saint-Andéol, 5 min from Mas.
2. It is one of the world’s greatest deep cave-diving sites (records down to -243 m).
3. The gallery network has never been fully explored, and it supplies the town’s drinking water.
4. Diving is reserved for specialists and regulated — check before any project.
5. The site can be visited on the surface (basins, antique wash-house, Mithras bas-relief): an unusual stop for everyone.

A bottomless abyss in the heart of the town: that is the kind of secret southern Ardèche holds. To be discovered on your next stay at Mas.