Best natural monuments around Chilly offer a landscape characterized by geological formations and riverine features. The region features deep gorges carved by rivers, significant geological fault mirrors, and historical caves. These natural attractions provide opportunities for exploration and understanding the area's natural history.
Last updated: June 18, 2026
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Very nice hike to do again
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Here lived free from May 12 to August 19, 1944 the maquisards of the secret army of the Megevant group, called "PAN PAN". A little history, even during a mountain bike outing, doesn't hurt!
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The Vuache Fault mirror is an easy to access but impressive site that is well worth a little detour!
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It’s beautiful… but not really passable by bike except mountain bike. It’s a gravel/stone path which, without big suitable tires, will make you skid.
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If you walk across the small bridge, the stream immediately disappears into a crevice in the ground. It is only when you walk a few meters further that you see which gorge the inconspicuous brook has washed over hundreds, even thousands of years before it flows into the Rhone shortly afterwards.
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This stone bridge dates from 1721, and allows you to admire the Fornant, as well as huge pots of giants. These cavities dug in the limestone rock are really surprising!
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Sillingy Rift Mirror is quite amazing. The place where two geological plates slide over each other is called a "fault mirror". You are currently in front of one of the most important mirrors in Europe! Panels allow you to learn more about the place, but also to understand the ecosystem of the cliff. It is home to many species. It is not uncommon to come across chamois there.
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A geological curiosity to see.
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Among the most appreciated natural monuments around Chilly are the Fier Gorge, known for its deep ravine and catwalk experience, and the Sillingy Fault Mirror, a significant geological site. Visitors also find the Resistance shelter 1944, a cave with historical importance, particularly interesting.
Yes, the Fier Gorge is considered family-friendly. It offers a unique experience with a catwalk suspended 25 meters above the river, making it an engaging visit for all ages. There's even a story for children related to the adjacent Chateau de Montrottier.
The Chilly area is rich in geological curiosities. You can visit the Sillingy Fault Mirror, which showcases where two geological plates slide over each other, making it one of Europe's most important fault mirrors. Additionally, the Pont de Pissieu allows you to admire the Fornant river and impressive 'giant's pots' – cavities carved into the limestone rock.
Yes, the Resistance shelter 1944 is a cave with significant historical value. It served as a shelter for the maquisards of the secret army's Megevant group from May to August 1944, offering a glimpse into the region's wartime past.
The region around Chilly offers various outdoor activities. You can find numerous running trails, cycling routes, and mountain biking trails. For example, a cycling route connects Annecy Old Town to the Sillingy Fault Mirror, and there are MTB trails like the Mount Sion ridge.
The Fier Gorge is located 10 km west of Annecy and is open from March 15 to October 15. There is an entry fee, and it's accessible by train or car with free parking available. A catwalk allows you to explore the gorge about 25 meters above the river, offering impressive views.
While specific wildlife sightings are not guaranteed, the Sillingy Fault Mirror is noted for its cliff ecosystem, which is home to many species. It is not uncommon to spot chamois in this area.
Absolutely. The Fier Gorge is a prime example, where the Fier river has carved a deep ravine. Another interesting spot is La Tine de Parrant, where a stream dramatically disappears into a crevice before flowing into the Rhône, showcasing impressive natural erosion.
Visitors frequently praise the unique geological formations and the historical significance of the sites. The Fier Gorge is often described as 'very very nice' and 'definitely worth seeing' despite visitor numbers. The Sillingy Fault Mirror is called 'quite amazing' and a 'geological curiosity to see'.
The Sillingy Fault Mirror features a gravel/stone path. While beautiful, it is generally not recommended for all bikes, especially those without big, suitable tires, as it can cause skidding. Mountain bikes are more appropriate for this terrain.
Yes, the Pont de Pissieu is a stone bridge dating back to 1721. It's considered a natural monument and offers excellent views of the Fornant river and the fascinating 'giant's pots' carved into the limestone.


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