4.5
(117)
777
hikers
35
hikes
Hiking around Grand Réservoir de Vioreau offers diverse trails around the largest reservoir in Loire-Atlantique, spanning 200 hectares. The landscape features expansive lake views, surrounding forests, and the historical Vioreau dam and canal system. Trails are generally accessible with minimal elevation changes, providing shaded paths through wooded areas. The region is also noted for its rich biodiversity, including numerous bird species.
Last updated: May 10, 2026
4.8
(26)
149
hikers
10.6km
02:41
30m
30m
Hike the 6.6-mile Lake Vioreau Loop, a moderate trail around the largest reservoir in Loire-Atlantique, offering diverse scenery and lake vi
5.0
(1)
11
hikers
7.23km
01:52
40m
40m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

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5.0
(1)
2
hikers
7.54km
01:57
40m
40m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
5.0
(2)
8
hikers
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
4.0
(2)
3
hikers
9.37km
02:24
40m
40m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
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The west bridge of Lake Voireau offers a beautiful, unobstructed view of the reservoir. The largest body of water in Loire-Atlantique, this lake stretches through the heart of the forest. Its wooded banks and landscaped beaches make it a pleasant stopover for a nature break or a swim.
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A perfect place to relax or have a picnic. You can cross the Erdre River to take a path opposite.
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Very beautiful place, banks of the Erdre below. Nice place to relax.
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This archway is accessible, but the following ones toward Nort-sur-Erdre are not, due to ongoing safety work. A beautiful spot down below for a picnic on the banks of the Erdre.
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The Grand Réservoir de Vioreau, located near Joué-sur-Erdre in the Pays de la Loire region, is an impressive body of water covering approximately 900 hectares. Originally built to regulate the flow of the Erdre and ensure the water supply to the surrounding areas, the reservoir now provides a magnificent setting for mountain biking. The surrounding trails offer varied terrain, from smooth lakeside paths to challenging and rugged sections through the nearby forests.
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The Ajeaux channel connects the Riaillé bodies of water (La Provostière and Poitevinière) to the large Vioreau Reservoir. The water thus transported allows the supply of the canal from Nantes to Brest.
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The Vioreau forest, located between the municipalities of Joué-sur-Erdre and Meilleraye-de-Bretagne, extends over 750 ha, 70 of which belong to the Department of Loire-Atlantique and are classified Sensitive Natural Areas (ENS). It adjoins to the north the large Vioreau reservoir, also departmental property, which is part of the Nantes-Brest canal supply system.
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There are over 35 hiking trails around Grand Réservoir de Vioreau, catering to various skill levels. You'll find a good mix of easy, moderate, and a few more challenging routes to explore the reservoir and its surrounding forests.
Yes, Grand Réservoir de Vioreau offers several easy and family-friendly hiking options. There are 12 easy routes, many of which are relatively flat and shaded, making them suitable for all ages. For example, the Rigole des Ajeaux loop from Aire naturelle "Le Temps de Vivre" is an easy 7.2 km path that explores the historic canal system.
Yes, circular walks are a popular feature of the area. Many trails offer loops around the lake and through the surrounding woodlands. A well-known option is the Lac de Vioreau — loop from Vioreau, which is a 10.6 km route that provides a pleasant circuit around the reservoir.
While hiking around Grand Réservoir de Vioreau, you can enjoy expansive lake views, tranquil forest paths, and rich biodiversity. Notable landmarks include the historic Vioreau Reservoir Dam and the feeding canal system. You might also spot the West bridge at Lac de Vioreau and the picturesque landscape of Petit Vioreau. The area is also a haven for birdwatchers, with an ornithological observatory available.
Yes, there is a waterfall at Grand Réservoir de Vioreau. A short detour from the main trails can lead you to the Vioreau waterfall, located at the dam's exit, which feeds into the Rigole de Vioreau.
The trails around Grand Réservoir de Vioreau are generally dog-friendly, allowing you to enjoy the natural surroundings with your canine companion. However, it's always recommended to keep dogs on a leash, especially in areas with wildlife or near other visitors, and to check for any specific local regulations.
The Grand Réservoir de Vioreau is enjoyable for hiking throughout much of the year. Spring and autumn offer pleasant temperatures and vibrant scenery. During warmer summer months, the shaded paths through wooded areas provide a welcome respite from the sun. Even in winter, the trails can offer a peaceful experience, though conditions may vary.
Yes, parking is generally available near the popular hiking trailheads around Grand Réservoir de Vioreau. Specific parking areas are often designated close to access points for the lake circuits and forest paths, making it convenient to start your hike.
The area is highly rated by the komoot community, with an average score of 4.5 stars from over 110 reviews. Reviewers often praise the tranquil and picturesque setting, the diverse landscapes, and the well-maintained paths that offer a mix of lake views and shaded forest sections. The accessibility of the trails for various fitness levels is also frequently highlighted.
Absolutely! Beyond hiking, Grand Réservoir de Vioreau is a hub for outdoor activities. The lake offers a supervised beach for swimming in summer, and you can enjoy water sports like paddleboarding, catamaran sailing, and kayaking. The 'Vioreau Pleine Nature' leisure base provides a range of outdoor sports, and the lake is also a popular spot for fishing.
Hiking a full loop around the Grand Réservoir de Vioreau, such as the Lac de Vioreau — loop from Vioreau (10.6 km), typically takes around 3 hours. The duration can vary based on your pace and how often you stop to enjoy the views or explore points of interest.
While Grand Réservoir de Vioreau is primarily accessed by car, public transport options to the immediate vicinity may be limited. It's advisable to check local bus schedules or regional transport services for connections to nearby towns like Joué-sur-Erdre, from where you might need to arrange further transport to the reservoir.


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