Baume des Crêtes

Baume des Crêtes is a vertical cave (gouffre) in the commune of Déservillers, in the Doubs department of the French Jura. It marks the highest of several entrances into the Verneau system, one of the region's largest underground cave networks, stretching for dozens of kilometres of galleries. The site is known mainly to cavers rather than casual visitors.

Where exactly is it located?

The cave opens on a limestone plateau near Déservillers, close to the boundary with the commune of Nans-sous-Sainte-Anne. Water entering the ground here and through other openings travels underground before resurfacing further down the valley, feeding the Lison, one of the Jura's well-known karst springs. The Déservillers plateau sits on typical Jura karst terrain, where sinkholes and cave entrances link up into extensive underground drainage systems.

What does the cave contain?

The entrance drops through a vertical shaft, followed by a series of smaller pitches and narrow, twisting passages. The route passes through several distinct chambers, including a flat hall known as the Réveillon room and the Dolois chamber, which holds gours — natural rock pools partly filled with water and sediment. Beyond these lies a striking passage known as the Gallery of the Chinese. The system descends to a depth of roughly one hundred and thirty to one hundred and eighty metres, reaching the level of the Verneau's main underground stream.

Can visitors explore Baume des Crêtes?

This is not a show cave open to the general public. The entrance is sometimes kept closed to protect fragile mineral formations inside, and the route demands full vertical caving equipment — ropes, harnesses, and rappelling skills for the pitches. The narrow, twisting squeeze near the entrance is demanding even for experienced cavers. As a result, the site is visited almost exclusively by organised caving groups, often during technical training sessions.

How was it discovered and explored?

Documented exploration began in the early twentieth century, when Professor E. Fournier surveyed the cave between 1903 and 1912, reaching as far as the Réveillon chamber from the Baume des Crêtes entrance. A major breakthrough came in the 1970s, when cavers enlarged the tight natural passage at the entrance, opening the way to the deeper parts of the system. In January 1972, explorers working from Baume des Crêtes reached the main Verneau underground stream, confirming the cave's connection to this extensive network.

Frequently asked questions

Can I visit Baume des Crêtes without caving experience? No. It is a technical cave that requires rope and rappelling equipment and the skills to move through vertical shafts and tight passages.

Is it part of a larger cave system? Yes — it is the highest entrance into the Verneau system, one of the more extensive underground networks in the French Jura.

Is the entrance always accessible? Not always. It is sometimes closed off to protect the delicate rock formations inside.

What should I know before planning a visit? A visit only makes sense as part of an organised caving expedition with proper technical preparation — this is not a casual walk-in site.