Caves around Plasne are situated in the Jura department of eastern France, a region known for its subterranean landscapes. While Plasne itself does not host major caves, the surrounding Jura Mountains offer diverse cave systems. These natural features showcase geological formations and historical significance. The area provides opportunities to explore various types of caves, from those with underground rivers to sites of paleontological importance.
Last updated: August 31, 2026
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A small but great cave - flashlight recommended.
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The grotto is currently not open! A fire completely destroyed the visitor center this spring. It is not yet known when the grotto will be open to visitors again. https://www.grottesdesmoidons.com/en/useful-information.htm
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After years of bans or restricted access, the Jura Departmental Speleology Committee reached an agreement with the municipality of Nevy-sur-Seille, and is now tenant of the cavity. The rental lease requires that the entrance be closed by an armored door, and its access reserved for clubs and individual members of the French Speleology Federation, or a foreign federation. Before any visit, to obtain the access code, you must submit a request to the C.D.S du Jura. (http://juraspeleo.ffspeleo.fr/grottes/topoguide/fiches/cassots.htm)
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This small cavity has the ceiling pierced at the beginning and at the end of the gallery. It would have sheltered a hermit.
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The Hole of the Moon is a cave dug in the limestone rock of the cliffs overlooking Poligny and its vineyards.
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A good 16 km of underground passages and galleries. A beautiful stream, very rich in stalactite jewelry, but also very dangerous during melting snow or long rainy days. As a result, the cave is also closed and access is only for organized cave exploration accessible.
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Great experience! Flashlight indispensable.
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While Plasne itself doesn't host major caves, the surrounding Jura Mountains offer several impressive options. These include the historically significant The Lodge at Maillet, the vast Gouffre de Poudrey known for its sound and light show, and the View of Poligny from Trou de la Lune, which offers both a cave experience and panoramic views.
Yes, several caves cater to families. The Cerdon Cave offers a unique blend of geological exploration and interactive prehistoric workshops like pottery and ochre painting. The Moidons Cave, when open, is also known for its family-friendly atmosphere, including a 'bat corner' and children's labyrinth, with accessible paths for strollers and wheelchairs.
Osselle Cave is renowned for its profound historical connections, having been visited since the 16th century, and is Europe's largest cave bear necropolis. The Lodge at Maillet is a historical site believed to have sheltered a hermit. Additionally, View of Poligny from Trou de la Lune is a cave where prehistoric artifacts have been excavated.
The caves in the Jura Mountains showcase diverse geological formations. You can expect to see impressive and colorful concretions, stalactites, stalagmites, columns, and draperies. Some caves, like Osselle Cave and Baume-les-Messieurs Cave, also feature underground rivers and lakes.
Osselle Cave offers a largely accessible 1,200-meter tourist trail, even for wheelchairs in many sections. The Moidons Cave, when open, also features paths designed for easy access, including for strollers and wheelchairs, and is lit by solar power.
The region around Plasne offers various outdoor activities. You can find numerous hiking trails, such as the 'Croix du Dan and Trou de la Lune Loop Trail', and mountain biking routes like the 'Frontenay Castle – Château-Chalon Village loop'. For more options, explore the Hiking around Plasne or MTB Trails around Plasne guides.
The Gouffre de Poudrey is known for its captivating sound and light show that narrates the Earth's history within its immense cavity. The Moidons Cave, when open, also features a sound and light show designed to highlight its geological wonders.
Some caves, like Grotte de Saint-Bilbalbo, can be explored independently, though a flashlight is recommended. However, for more extensive or challenging systems like the Entrance to Grotte de la Borne aux Cassots, access is restricted to organized speleology clubs due to safety concerns and the need for specific permits.
The Moidons Caves are currently not open to visitors due to a fire that destroyed the visitor center. It is advisable to check their official website for updates on reopening before planning a visit.
The Entrance to Grotte de la Borne aux Cassots is a challenging cave with almost 16 km of underground passages. It is very dangerous during melting snow or long rainy days and is only accessible to organized speleology clubs with proper permits and equipment.
Caves generally maintain a cool, consistent temperature year-round, making them a good option in various seasons. However, for caves with underground rivers or those prone to flooding, like the Entrance to Grotte de la Borne aux Cassots, it's best to avoid visiting during periods of heavy rain or snowmelt.
Yes, the View of Poligny from Trou de la Lune is a cave that also serves as a viewpoint, offering beautiful vistas over Poligny and its vineyards from the cliffs above.


Extend your search for the best caves by checking out these guides of the top ones around Plasne: