Best natural monuments around By include a diverse landscape featuring significant karst formations. The area is characterized by powerful springs, extensive cave systems, deep gorges, and elevated viewpoints. These natural features offer opportunities to explore geological formations and water sources.
Last updated: June 21, 2026
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a perfect place to recharge your batteries
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Remember not to venture too far into the cave
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The spring is simply gigantic and there aren't too many tourists - at least when we were there.
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The ascent to the cross is car-friendly and has steps. The GR59 may have been rerouted in the meantime, but a detour here is definitely justified. The paths on Mt Poupet are well signposted and the summit cross is highly recommended.
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The Verneau is an underground river in the Franche-Comté Jura. It collects water from the Déservillers plateau and comes to the surface near Nans-sous-Sainte-Anne before flowing into the Lison. It is one of the largest underground rivers in France. During our visit, we found a notice saying that it is forbidden to enter the area around the spring or waterfall.
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This highlight is located on the plateau under which the cave opening is located. It can be found via a dead-end path, but the view is a bit sobering.
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The Sarrasine Cave impresses with its 90 m high portal. A 40 m thick layer of limestone separates it from the upper part of the plateau. The cave system has been explored for about 4 km, and hikers equipped with a flashlight can access it up to a small lake inside. https://www.lieux-insolites.fr
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The By area is characterized by a diverse landscape featuring significant karst formations. You'll discover powerful springs, extensive cave systems, deep gorges, and elevated viewpoints, showcasing a variety of geological wonders.
Yes, Lison Spring is a great option for families. It features an accessible path leading to a powerful waterfall, a cave you can enter, and a natural swimming pool at the base of a cliff.
For breathtaking vistas, visit Croix de Poupet. From this viewpoint, you can enjoy panoramic views of Salins-les-Bains and, on clear days, even Mont Blanc.
Beyond Lison Spring, you can explore the impressive Sarrazine Cave, known for its 100-meter-high and 30-meter-wide entrance resembling a 'wild cathedral'. Another significant site is Creux Billard — Karst Basin and Waterfall, a mighty karst cauldron with an underground cave system connected to the Lison Spring.
For the most impressive display of waterfalls and springs like Lison Spring and Creux Billard, it is best to visit after long periods of rain, when the water flow is at its most powerful.
Yes, the By area offers numerous hiking trails. You can find routes near these natural monuments, including moderate options like the 'Poupet Cross – Mont Poupet loop from Saint-Thiébaud'. For more details and routes, explore the Hiking around By guide.
Absolutely. The region provides various options for outdoor activities. For running, consider routes like the 'Croix de Poupet – Mont Poupet loop from Saizenay' found in the Running Trails around By guide. Cyclists can enjoy routes such as the 'View of the Loue – Bridge over the Loue loop from Samson' from the Road Cycling Routes around By guide.
Visitors frequently praise the powerful waterfalls, the impressive scale of the cave entrances, and the stunning panoramic views. The accessibility of some sites, like the path to Lison Spring, is also highly appreciated.
While Verneau Spring is a beautiful sight, visitors should be aware that access directly around the spring or waterfall may be restricted. Notices are often posted indicating areas where entry is forbidden.
To fully appreciate the scale and unique features of Sarrazine Cave, including its impressive entrance and initial accessible sections, allow at least an hour. If you plan to explore the surrounding area or nearby trails, you may want to allocate more time.
Yes, Lison Spring is highly popular, receiving many upvotes and photos from visitors. Sarrazine Cave and Croix de Poupet are also frequently highlighted by the community for their unique appeal.


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