4.6
(1085)
8,815
hikers
Dog friendly hiking trails around Étangs de Fontargente are set within a glacial cirque in the French Pyrénées, featuring three mountain lakes at an altitude of approximately 7,020 feet (2140 meters). The terrain varies from established paths and grassy plateaus to rocky sections, surrounded by peaks such as Pic de Rulhe and Pic de Fontargente. The Aston Valley, characterized by its winding river and streams, provides access to these trails. Hikers can experience diverse landscapes, including high mountain passes like…
Last updated: October 15, 2026
4.8
(18)
256
hikers
16.0km
07:21
1,030m
1,030m
Hard hike. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
5.0
(4)
47
hikers
17.3km
07:24
960m
960m
Hard hike. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.

5.0
(1)
9
hikers
25.5km
10:05
1,250m
1,250m
Hard hike. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
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Magnificent routes to explore in the region
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It's not hardcore, and I think three technical points are too many. There's a lot of elevation gain and a fair amount of distance, but no scrambling and no exposed sections. It's a fairly easy and beautiful tour for this altitude.
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Magnificent pond in the hollow of the mountains, fed by the Mourguillou stream. Superb hike through the pastures in the jasse de Mourguillou.
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Mérens-les-Vals is a rural commune of nearly 200 inhabitants located on the banks of the Ariège River, in the eponymous valley that connects Ax-les-Thermes to the Andorran border. The commune has long been known for giving its name to a breed of horse (the Mérens, small black-coated riding horses). Today, it enjoys a fine reputation as a stopping point on major hiking trails. Whether you're hiking the GR 10, 107, the GRP® Tour of the Ax Mountains, or planning a day hike, this small village tucked away in the valley is a must-see. There, you'll find a train station with regular service from Toulouse. Adjacent to the station, you'll find a pleasant bistro and mini-market. Stop by for a simple coffee break or a stock-up on food. There's no shortage of accommodation options. You can book a room or a gîte year-round. In summer, you can choose a campsite located on the left bank of the Ariège River, one kilometer north of Mérens, on the Chemin des Bonshommes, which is part of the GR 107 hiking trail.
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The Estagnol pond culminates at 1,650 meters in the Mourgouillou valley. Headed by the Mourgouillou hut, the pond is an ideal resting place, both for the animals in the summer pastures and for walkers on a walk. If the summer is hot, dip your hands in it to cool off. Be careful to filter the water if you want to drink it: despite its sometimes crystalline colors, the presence of cattle brings bacteria that are not very appreciable for your stomach.
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On the road to Mérens-les-Vals, the Mourgouillou hut is your last stop. It stands in an idyllic environment, ideal for taking a last break before Mérens-les-Vals. The small stone construction pierced with a door and a window is basic but has the essentials for a successful break. There is a fireplace and a side wall on which up to four people can sleep head to tail. For water and wood, the surrounding streams and woods provide the necessary. Your break is over, you only have one hour of downhill walking to reach Mérens-les-Vals.
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very stony path on the orographic left bank.
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When you descend to the lake you come to a grotto.
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There are three challenging dog-friendly hiking routes detailed in this guide for the Étangs de Fontargente area. These trails offer a robust experience for well-exercised dogs and their owners.
While the Étangs de Fontargente area is generally welcoming to dogs, it's crucial to keep your dog on a leash, especially due to the presence of local fauna like Mérens horses and marmots, and to respect the natural environment. Always clean up after your dog to preserve the pristine beauty of the glacial cirque.
The routes featured in this guide are all rated as 'difficult,' involving significant elevation gain and distance. For easier options, you might consider shorter, out-and-back walks from the Pla de las Peyres parking area, which offer less strenuous terrain, though these are not specifically detailed as dog-friendly in this guide.
The trails around Étangs de Fontargente feature diverse terrain, including established paths, grassy plateaus, and more rocky sections and scree fields. Some routes may also include features like a metallic footbridge. Your dog should be comfortable with varied and sometimes uneven surfaces.
The primary attractions are the three serene mountain lakes themselves, known for their clear, often emerald-green waters. You'll also be hiking within a dramatic glacial cirque, surrounded by imposing peaks like Pic de Rulhe and Pic de Fontargente. The Waterfall – Étang de Pedorrès loop and the Waterfall – Rocky Valley View loop both feature impressive waterfalls and stunning valley views.
Yes, the main starting point for many hikes in the area is the Pla de las Peyres parking area, which is accessible by road. This provides a convenient base for beginning your dog-friendly adventure.
The best time to visit is generally during the summer months when there is no snow, typically from late spring to early autumn. This ensures more accessible trails and pleasant weather conditions for both you and your dog. Always check local weather forecasts before heading out.
Yes, all three routes listed in this guide are circular. For example, the Étang de Couart – Étang de Pedorrès loop offers a challenging circular journey through the stunning landscapes.
Beyond your usual hiking gear, remember to pack essentials for your dog: a leash, water and a portable bowl, dog food/treats, waste bags, and possibly a first-aid kit for pets. Given the challenging nature of these trails, ensure your dog is fit and accustomed to long distances and elevation changes.
The area is highly rated by the komoot community, with an average score of 4.6 stars from over 860 ratings. Reviewers often praise the stunning landscapes, the serene mountain lakes, and the dramatic glacial cirque, making it a captivating destination for those seeking natural beauty.
Access to the main starting points like Pla de las Peyres is primarily by road. Public transport options directly to the trailheads are limited, so planning for private vehicle access is generally recommended for convenience when hiking with a dog.
The Étangs de Fontargente themselves are beautiful mountain lakes, and while dogs often enjoy water, it's important to be mindful of the fragile alpine ecosystem. If your dog does enter the water, ensure they do not disturb wildlife or contaminate the pristine environment. Always check for any specific local regulations regarding swimming in the lakes.


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