Best caves around Achères-La-Forêt, situated on the edge of the Fontainebleau forest, present a unique combination of natural rock formations and historical sites. This region is characterized by its sandstone slabs and geological features, offering a diverse landscape for exploration. Visitors can discover both natural rock shelters and semi-natural cave formations. The area is also known for its historical significance, including sites developed for early recreational exploration.
Last updated: October 22, 2026
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The mouse cave is a Milly classic that all children know. It is a large cavity about 20 meters long, where you cannot stand up. It is even possible to exit through a narrow passage.
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A hike over and between large stones
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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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Good overview over the Apremont Climbing areas.
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The region's caves offer a fascinating glimpse into history. For instance, the Grotte du Serment was created by Claude-François Denecourt in 1853, a key figure in developing Fontainebleau's hiking trails. Its engraved initials "D.F.D." (Dernière Folie Denecourt) tell a story of his dedication to the forest. Additionally, the shelters at Les Grottes et Abris du Rocher de la Combe are known for prehistoric rock art, with over 2,000 engravings believed to date back to the Mesolithic period.
Yes, several spots are great for families. The Druids' Den is a vast rock shelter that children particularly enjoy for hiding and exploring. Another popular choice is the Mouse Cave, a classic spot in Milly with a large cavity that kids love to navigate, even exiting through a narrow passage.
The region is rich in unique geology. Les Platières d'Achères-la-Forêt / Meun feature distinctive sandstone slabs, often fissured, creating a chaotic landscape of interlocking blocks and natural rock shelters formed by erosion. The sandstone, known as Fontainebleau sand, is highly pure. The Grotte du Serment is also notable for its vault, composed of a single rock, and ancient concretions along a vertical fault.
The area around Achères-La-Forêt is perfect for various outdoor activities. You can find numerous hiking trails, including the "Sentier des Carriers" which passes by the Grotte du Serment, and the "Grande boucle d'Achères" which traverses Les Platières. For more options, explore the hiking routes around Achères-La-Forêt. There are also excellent running trails and cycling routes available.
Yes, the View of the Fontainebleau Forest from the Caverne des Brigands offers a superb panorama over the Fontainebleau forest, particularly on the Barbizon side. It provides magnificent views over the Gâtinais region, with trees stretching as far as the eye can see, and is also a good overview of the Apremont Climbing areas.
The Fontainebleau forest, including the cave and rock shelter areas, is enjoyable year-round. Spring and autumn offer pleasant temperatures for hiking and exploring, with vibrant foliage or blooming nature. Summer can be warm but the forest provides shade. Winter visits are also possible, though some paths might be muddy. Always check local weather conditions before your visit.
Absolutely. The Bandits' Cave (La Caverne des Brigands) was intentionally dug in 1844 at the request of Denecourt, who then invented a story of bandits to attract tourists. This highlights the early efforts to promote tourism in the Fontainebleau forest and adds a touch of playful local lore to your visit.
Yes, many of these formations are integrated into the region's extensive trail network. For example, the Grotte du Serment is located along the "Sentier des Carriers" (Quarrymen's Path), which is a well-known hiking route. Les Platières d'Achères-la-Forêt / Meun are part of the "Grande boucle d'Achères," a circuit that allows you to explore the unique rock formations and surrounding forest.
The caves and rock shelters are nestled within the diverse environment of the Fontainebleau forest. Areas like Les Platières d'Achères-la-Forêt / Meun feature a mosaic of natural habitats, supporting specific flora and fauna that thrive in the thin, poor soil covering the sandstone slabs. The Rocher de la Combe is part of a protected biological reserve, offering varied terrains including woodlands and rocky outcrops, making it ideal for nature observation.
While specific parking details for each individual cave are not always provided, the Fontainebleau forest area generally has designated parking lots at various trailheads and popular access points. When planning your visit, it's advisable to check maps for parking areas near the specific cave or rock shelter you intend to explore, especially if you are starting a hike.
Given that many of these sites are natural formations within a forest environment, comfortable hiking shoes with good grip are essential. Layers of clothing are recommended as temperatures can vary, especially inside deeper shelters. A headlamp or flashlight can be useful for exploring darker sections of some caves. Always bring water, and consider a map or GPS device for navigation on the trails.


Extend your search for the best caves by checking out these guides of the top ones around Achères-La-Forêt: