4.6
(8101)
103,288
hikers
934
hikes
Hiking around Réserve naturelle de Passy offers diverse landscapes within the Mont-Blanc massif, facing the Aiguilles Rouges mountains and overlooking the Arve Valley. The region features a striking contrast between crystalline reliefs and abrupt, calcareous cliffs, including the prominent Fiz mountain range. This geological diversity supports environments ranging from forests and alpine meadows to heathlands and wetlands.
Last updated: June 27, 2026
4.6
(59)
657
hikers
3.91km
01:07
90m
90m
Moderate hike. Great for any fitness level. Mostly accessible paths. Sure-footedness required.
4.8
(44)
666
hikers
16.7km
06:11
850m
850m
Hard hike. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.

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4.7
(40)
638
hikers
13.0km
05:14
760m
760m
Hard hike. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
4.6
(73)
574
hikers
7.21km
02:27
340m
340m
Moderate hike. Good fitness required. Mostly accessible paths. Sure-footedness required.
4.8
(57)
467
hikers
7.05km
02:16
300m
290m
Moderate hike. Good fitness required. Mostly accessible paths. Sure-footedness required.
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Large, completely free parking lot in a great location
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Be sure to arrive early. Despite the large parking lot, it fills up quickly. We arrived at 7:00 AM because of the heat, and there was plenty of room. By noon, when we left, there was a fight for our spot.
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A beautiful family hike below Les Fiz and Pormenaz, with a beautiful view of Mont Blanc and the valley. From here, you can access Lake Pormenaz via three trails, including "La Chorde," reserved for those with mountain feet, with cable passages and ladders, and "Les Argentières," a less challenging route with cable passages and steps, and then the one passing through the Pierre à l'Ours on the mountainside.
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the video of the sallanches - lake of Pormenaz route https://youtu.be/l23IUvTwiSc?si=zyzWhbqQLNobocY-
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Le Chatelet D'Ayères at 1.415m altitude is a small family accommodation at 1415 m altitude, nestled close to the Fiz mountain range with excellent views of Mont Blanc
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Huge parking lot. Starting point for many activities
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I loved this lake! and even more so to go around it (with some complicated steps) and see it full of fish.
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Réserve naturelle de Passy offers a vast network of over 900 hiking trails. These routes cater to various skill levels, from easy walks to challenging mountaineering routes, ensuring there's something for every hiker.
Yes, there are numerous easy and family-friendly options. A popular choice is the trail around Lac Vert, known for its emerald waters and stunning reflections of Mont Blanc. For a slightly longer but still accessible loop, consider the Plaine-Joux Parking – Green Lake loop from Lac Vert, which is about 7.3 km and takes around 2 hours 20 minutes.
It's important to note that dogs are prohibited in certain areas of the Réserve naturelle de Passy, even on a leash, to protect the local wildlife and environment. Please check specific trail regulations before planning your hike with a dog.
The reserve boasts diverse landscapes, from forests and alpine meadows to heathlands and wetlands. You'll encounter a striking contrast between crystalline reliefs and the abrupt, calcareous cliffs of the Fiz mountain range. Key features include the stunning Lac Vert, the high-altitude Lac de Pormenaz, and the unique mineral landscape of the Désert de Platé.
Yes, many trails in Réserve naturelle de Passy are designed as loops. For example, the Incredibly beautiful view! – Les Ayères fountain loop from Lac Vert offers expansive views over 16.8 km. Another challenging circular option is the Incredibly beautiful view! – Lac de Pormenaz loop from Lac Vert, which leads to a beautiful high-altitude lake.
Beyond the beautiful lakes, you can explore the dramatic 600-meter vertical walls of the Fiz cliffs. The Col d'Anterne offers spectacular views of the Mont-Blanc massif. For a unique experience, the Désert de Platé presents an exceptional mineral landscape. You might also encounter the Les Ayères fountain on some routes.
The best time to visit for hiking is generally from late spring to early autumn (May to October) when the trails are clear of snow and the alpine flora is in bloom. High-altitude lakes like Lac de Pormenaz can remain frozen for up to six months, so summer offers the best access to these areas. Always check local conditions before heading out.
The diverse environments support rich biodiversity. Keep an eye out for chamois, ibex, and marmots. Birdwatchers might spot ptarmigan, grouse, eagles, and even bearded vultures. The reserve is home to over 530 plant species, including the St. Bruno lily and Martagon lily.
Absolutely. For experienced hikers, routes like the "Tour des Fiz" are considered among the most beautiful and wild in the Northern Alps, featuring breathtaking panoramas and some exposed sections. The Pointe du Dérochoir also offers a very mineral environment with exceptional views but is reserved for experienced hikers due to dangerous passages. Routes like Pas de Sales – Anterne Alfred Wills Refuge loop from Bonneville are also considered difficult.
Yes, parking is generally available at key access points to the reserve, such as near Plaine-Joux. These parking areas serve as starting points for many popular trails, including those leading to Lac Vert.
The trails in Réserve naturelle de Passy are highly rated by the komoot community, with an average score of 4.6 stars from over 8000 reviews. Hikers frequently praise the stunning panoramic views, the unique geological features, and the variety of routes available for all fitness levels.
The reserve's geology is characterized by a striking contrast between ancient crystalline, gentle reliefs and the younger, abrupt calcareous cliffs of the Fiz mountain range. This geological history, spanning 90 million years of shared ocean and Alpine history, has created a diverse mineralogical environment, from siliceous rocks at Pointe de Pormenaz to the dramatic Fiz cliffs.
Yes, the reserve is home to beautiful high-altitude lakes. Besides the accessible Lac Vert, you can hike to Lac de Pormenaz. Reaching Lac de Pormenaz can involve challenging routes with cables and ladders, offering a rewarding experience for those seeking a more adventurous trek.


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