Best natural monuments around Thomery include diverse natural sites situated along the River Seine and within proximity to the expansive Fontainebleau Forest. This region features unique geological formations, riverine landscapes, and extensive forest areas. The natural environment around Thomery reflects a blend of natural beauty and historical interaction with human activity, particularly in its cultural landscapes. Visitors can explore a variety of natural settings, from caves to forest trails.
Last updated: August 19, 2026
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Quite a nice route, with a short stretch of track between the 19th and 22nd km
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I do believe this is an excellent website. I stumbled upon it I may revisit once again since I saved as a favorite it. https://www-sunpass.com
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The Gros Fouteau road, in the heart of the managed biological reserve of Mont Ussy and Butte aux Aires, offers an immersion in unspoiled nature. This forest path winds through wild and varied landscapes, where century-old trees, such as the majestic Gros Fouteau, stand proudly. Here, you can discover the richness of the local biodiversity, with green clearings and magnificent viewpoints of the surrounding hills.
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What immediately catches the eye are the water lilies which partly cover this 20 m diameter pond. In March, toads and frogs meet up to lay eggs. The name of this pond comes from the fact that a man named Piat, general forest guard, would have had trouble with people who had to complain about his severity in the service and who would have thrown him into the pond. This forced bath was not fatal to him, since he died at the age of 81, on August 26, 1805, leaving a large family.
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The cave of the oath is quite surprising, especially because the vault is made of a single rock. The letters D.F.D were engraved on the cave by Denecourt himself and mean "Last Madness Denecourt".
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Here we find the famous rocky rocks of the French Gâtinais regional natural park. Climbing is practiced there but this place is also an ideal setting for hiking. Let yourself be disoriented by the unusual character of the site.
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The Béatrix cave is a natural wonder hidden in the forest of Fontainebleau. This cave, dug in the sandstone, is accessible during an outing in the forest. It offers an enchanting spectacle with its stalactites, its concretions and its walls covered with moss. It is also known to have been the place of meditation of Queen Marie-Antoinette.
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The region around Thomery offers a diverse range of natural features. You can discover unique geological formations like the Grotte du Serment and Béatrix Cave, both notable for their rock formations. The area also features serene water bodies such as Piat Pond, and extensive forest paths like the Gros Fouteau Road, offering immersion in unspoiled nature. Additionally, the nearby Fontainebleau Forest provides vast landscapes with sand, remarkable trees, and picturesque rock formations.
Yes, several natural monuments around Thomery are suitable for families. Piat Pond is a great spot for a relaxed visit, often found along scenic trails. The Gros Fouteau Road also offers a family-friendly forest path through varied landscapes, perfect for a leisurely walk amidst nature.
The Thomery region, particularly its proximity to the Fontainebleau Forest, is rich in geological wonders. You can explore fascinating caves like the Grotte du Serment, known for its single-rock vault, and Béatrix Cave, carved into a rocky massif. Additionally, the Famous Rocks of the Gâtinais Français offer an unusual and disorienting site with prominent rock formations.
The natural monuments around Thomery are excellent starting points for various outdoor activities. You can enjoy extensive hiking trails, explore the scenic routes by cycling, or go running through the beautiful forest landscapes and along the River Seine. The Fontainebleau Forest, in particular, offers a vast network of trails for all levels.
Yes, some natural sites around Thomery have historical significance. The Grotte du Serment, for instance, bears the engravings "D.F.D" by Claude-François Denecourt, a key figure in developing hiking trails in the Fontainebleau Forest. This links the natural geology with local history and the early days of outdoor exploration in the region.
The natural monuments around Thomery are beautiful year-round, but autumn is particularly recommended for its vibrant foliage. The extensive forests, including the nearby Fontainebleau Forest, transform with rich colors, offering stunning scenic views for hiking and exploration. Spring also brings lush greenery and pleasant temperatures.
While popular sites attract visitors, the vastness of the Fontainebleau Forest and the numerous trails mean you can often find quieter spots. Exploring lesser-known paths within the forest or visiting during off-peak hours can lead you to serene areas. The Gros Fouteau Road, for example, offers an immersion in unspoiled nature that can feel secluded.
Visitors frequently appreciate the unique blend of natural beauty and historical intrigue. The surprising single-rock vault of the Grotte du Serment and its historical engravings are often highlighted. The scenic beauty of spots like Béatrix Cave and the tranquility of Piat Pond are also highly rated. Many enjoy the immersion in unspoiled nature offered by forest paths and the disorienting character of the Famous Rocks of the Gâtinais Français.
Yes, many natural monuments around Thomery are accessible via well-maintained hiking trails. For example, Béatrix Cave is often found at the end of a beautiful hike within a rocky massif. The Piat Pond is also located on the edge of the Denecourt-Colinet trail n°5. You can find numerous hiking routes that incorporate these natural highlights.
While many natural monuments are situated within forests or more remote areas, Thomery itself and nearby villages offer cafes and restaurants. It's advisable to check the specific location of the natural monument you plan to visit and research nearby amenities beforehand. For longer excursions, packing your own refreshments is recommended.
When exploring the natural sites around Thomery, especially for hiking or longer walks, it's recommended to bring appropriate footwear, water, snacks, and a map or GPS device. Depending on the weather, layers of clothing, sun protection, and rain gear can also be useful. For cave explorations, a headlamp or flashlight is advisable.
Many natural areas and trails in the Fontainebleau Forest and around Thomery are dog-friendly, provided dogs are kept on a leash to protect wildlife and ensure the safety of other visitors. However, specific rules might apply to certain protected areas or caves. Always check local signage or regulations for each specific site you plan to visit with your dog.


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