Réserve Biologique Intégrale De Merdassiers Nant Pareux
Réserve Biologique Intégrale De Merdassiers Nant Pareux
4.5
(2723)
28,197
hikers
294
hikes
Hiking in Réserve Biologique Intégrale De Merdassiers Nant Pareux offers access to a highly protected natural area within the scenic Aravis mountain range. This integral biological reserve is characterized by a pristine forest ecosystem, with human intervention strictly prohibited to allow for natural evolution. The terrain includes dramatic mountainous backdrops, alpine meadows, and dense forests, encompassing the upper reaches of the Flon valley. Prominent peaks such as Le Treu, Les Trois Aiguilles, and Tête de l'Aulp define the landscape, providing…
Last updated: October 1, 2026
4.0
(2)
20
hikers
10.6km
03:52
530m
530m
Moderate hike. Good fitness required. Mostly accessible paths. Sure-footedness required.
5.0
(2)
16
hikers
16.1km
04:46
500m
500m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

5.0
(1)
18
hikers
2.21km
01:09
180m
180m
Moderate hike. Great for any fitness level. Mostly accessible paths. Sure-footedness required.
4.0
(4)
27
hikers
8.23km
03:31
540m
540m
Moderate hike. Good fitness required. Mostly accessible paths. Sure-footedness required.
7
hikers
3.11km
00:54
90m
90m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
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Popular around Réserve Biologique Intégrale De Merdassiers Nant Pareux
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Running Trails in Réserve Biologique Intégrale De Merdassiers Nant Pareux

Gravel biking in Réserve Biologique Intégrale De Merdassiers Nant Pareux
Nice small pass, decent but steady climb. Great views and a nice restaurant at the pass, Refuge Auberge du Col de l'Arpettaz
3
0
Beautiful small pass, small roads with little traffic, great views. Nice restaurant on the pass.
3
0
Little-known and little-frequented pass, the climb is done alone and without a sound in the forest. The view is magnificent and on arrival, the refuge allows you to have a small drink (⚠️payment by species only). The road is in poor condition and it can be disturbing on the way down. If you have a Gravel and courage, the thirst route (Gravel/mountain bike path) allows you to reach the Col des Aravis and is magnificent. Enjoy your climb and for more advice, follow us on Komoot and Instagram @chouchou_team
1
0
At this point you have two options, either turn left and join Chaucisse via the 4x4 track, or continue straight to Les Stallets and take the path which leads to Le Treu, to join Chaucisse, more interesting in my opinion.
0
0
Offers views on both sides of the valley. It is also the limit of the mountain, the Croix Cartier. If you want to picnic, further down there is a picnic table under a tree.
0
0
This mountain pass is located at 1,581 meters in the Aravis massif. Located between Mont Charvin and Mont Blanc, it offers magnificent views. Several variations of ascent allow you to reach it by crossing spectacular landscapes.
1
1
A large grassy mountain, perched in the hills above the town of Ugine, and located near the Col de l'Arpettaz. From the summit, you will enjoy superb views of the Aravis, the Mont-Blanc massif and the Beaufortain.
1
0
Very beautiful pass, regular and wild, very beautiful view
0
0
There are over 270 hiking routes in the Réserve Biologique Intégrale De Merdassiers Nant Pareux, catering to various skill levels. This includes over 70 easy routes, more than 150 moderate trails, and around 40 difficult options for experienced hikers.
The reserve is nestled in the eastern Aravis mountain range, offering dramatic mountainous backdrops. You'll encounter diverse landscapes, from alpine meadows to dense, pristine forests and the upper reaches of the Flon valley. Prominent peaks like Le Treu, Les Trois Aiguilles, and Tête de l'Aulp define the scenery.
Yes, many routes in the reserve are circular. For example, the Col de l'Arpettaz – Arpettaz Pass loop from Col de L'Arpettaz is a moderate 4.7 km path offering accessible views. Another option is the Praz Vechin loop from Retorney, an 8 km moderate hike.
The trails in Réserve Biologique Intégrale De Merdassiers Nant Pareux are highly rated by the komoot community, with an average score of 4.6 stars from over 2,100 reviews. Hikers often praise the untouched natural environment, the diverse terrain, and the immersive wilderness experience offered by this protected area.
While the reserve offers a range of difficulties, many moderate routes are suitable for families. The Col de l'Arpettaz – Arpettaz Pass loop from Col de L'Arpettaz, at 4.7 km, is a good example of a shorter, accessible loop that families might enjoy.
As an Integral Biological Reserve, the primary purpose is the observation of natural evolution with minimal human intervention. This often means strict regulations regarding pets to protect wildlife. It is highly recommended to check local signage and official park guidelines regarding dog access before your visit.
Parking is typically available at common starting points for hikes, such as near the Col de l'Arpettaz. It's advisable to arrive early during peak seasons to secure a spot, especially for popular routes like the Waterfall – Praz Vechin loop from Col de L'Arpettaz.
Generally, access to Integral Biological Reserves in France is regulated to protect the environment. While specific permits for hiking may not always be required for established trails, it's crucial to respect all regulations regarding access, staying on marked paths, and protecting the pristine ecosystem. Always check official local information before your visit.
The best time to hike typically depends on the specific trail and your preferences. Summer and early autumn generally offer the most favorable weather conditions for exploring the alpine meadows and dense forests. During winter, some trails may be covered in snow and require specialized equipment or experience.
Yes, the reserve offers around 40 difficult routes for experienced hikers. An example is the Waterfall – 🤩 Section of the trail to the summit loop from Col de L'Arpettaz, which is an 11.2 km trail with significant elevation gain, making it a demanding option.
Yes, some routes incorporate natural water features. The Waterfall – Praz Vechin loop from Col de L'Arpettaz is a 10.4 km moderate trail that includes a waterfall, offering a scenic highlight during your hike.
Hike durations vary widely depending on the route's length and difficulty. Shorter loops like the Col de l'Arpettaz – Arpettaz Pass loop can take around 2 hours, while longer, more challenging trails such as the Col de l'Arpettaz – Stata Cross loop might take closer to 5 hours or more.


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