4.8
(8)
110
riders
6
rides
No traffic gravel bike trails around Le Sourn are characterized by a diverse landscape, featuring the winding Blavet River Valley and the historic Nantes to Brest Canal. The region's topography ranges from 46 meters to 184 meters, offering a mix of gentle canal paths and more undulating terrain. This varied environment provides extensive networks of routes suitable for gravel biking, including greenways and towpaths. The area is defined by its waterways and varied elevation, with the village center situated at the base of a granite massif.
Last updated: May 22, 2026
4.4
(5)
62
riders
40.4km
02:01
160m
160m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
23
riders
146km
07:42
1,070m
1,070m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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5.0
(1)
14
riders
77.2km
04:08
610m
610m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5
riders
21.6km
01:29
220m
220m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
6
riders
27.7km
01:30
200m
200m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Popular around Le Sourn
A great detour to Saint Aignan, the Les Pêcheries de Guerlédan restaurant is very welcoming, with bike parking, a generous meal and welcome. Crossing the village, you can reach the canal a little further on via the lock.
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Average but good
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No tip, just enjoy this timeless (well not quite but hopefully you get what I mean) scene
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A stretch on the dam before the Trehu Moron dam. The landscape is constantly changing. The canal meanders through the countryside here. I love this landscape, and it's a good mood to drive here.
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Very nice lock along the canal
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There are 7 dedicated no-traffic gravel bike trails around Le Sourn featured in this guide. These routes offer a mix of easy, moderate, and difficult options, ensuring there's something for every skill level.
The terrain around Le Sourn is varied, perfect for gravel biking. You'll find extensive greenways and towpaths along the Blavet River and the Nantes to Brest Canal, offering relatively flat and smooth sections. However, the region also features undulating terrain with varied elevations, especially as you move away from the immediate waterways into the Plurit and Resto Valleys. The gravelly surface around Lac de Guerlédan is also noted for a pleasant riding experience.
Yes, the region offers several routes suitable for families, particularly those along the Canal de Nantes à Brest and the Blavet River. These paths are generally flat and traffic-free, providing a safe and enjoyable environment. For an easy option, consider the Pontivy Castle – Cascade Lock loop from Pontivy, which is just over 21 km and offers gentle slopes.
The no-traffic gravel trails around Le Sourn are rich in history and natural beauty. You can encounter numerous historical locks and chapels along the Blavet River and the Nantes to Brest Canal. Notable attractions include the impressive Pontivy Castle, the serene Saint-Nicodème Chapel, and the Guernal lock on the Nantes-Brest canal. The Canal de Nantes à Brest itself from Pontivy to Mûr-de-Bretagne is a significant highlight.
The best time for gravel biking in Le Sourn is generally during the spring and autumn months when the weather is mild and the natural scenery is at its most vibrant. Summer also offers pleasant conditions, though it can be busier. While some areas can be humid, especially in the valleys, the well-maintained greenways and towpaths are enjoyable in most seasons. Always check local weather forecasts, especially after heavy rain, as some unpaved sections might become muddy.
Yes, many of the no-traffic gravel routes around Le Sourn are designed as loops, allowing you to start and end at the same point. For example, the Cascade Lock – Canal de Nantes à Brest loop from Le Sourn offers a moderate 49 km circular ride, and the Rohan Castle – Cascade Lock loop from Neulliac is another excellent moderate option at just over 40 km.
The trails around Le Sourn cater to various skill levels. This guide includes 1 easy route, 4 moderate routes, and 2 difficult routes. Easy routes typically follow flat canal paths, while moderate routes might include some gentle ascents and descents. Difficult routes, such as the Cascade Lock – Lock No. 138 of Bon Repos loop from Noyal-Pontivy (over 133 km with 764m elevation gain), involve longer distances and more significant climbs.
Access points for the Canal de Nantes à Brest and Blavet River trails often have parking available in nearby towns like Pontivy, Neulliac, or Le Sourn itself. Many routes start from these locations, making it convenient to park your vehicle and begin your ride directly on the traffic-free paths.
The area is highly rated by the komoot community, with an average score of 4.3 stars. Reviewers often praise the peaceful, traffic-free nature of the routes, the scenic beauty of the Blavet River Valley and Nantes to Brest Canal, and the historical points of interest along the way. The varied terrain, from smooth towpaths to more challenging gravel sections, is also frequently highlighted as a positive aspect.
Yes, for experienced riders seeking a longer and more challenging adventure, the Cascade Lock – Lock No. 138 of Bon Repos loop from Noyal-Pontivy is an excellent choice. This difficult route spans over 133 km with a significant elevation gain of 764 meters, offering a full day of immersive gravel biking through diverse landscapes.
While Le Sourn itself is a smaller commune, nearby towns like Pontivy often serve as hubs for public transport. Cyclists can typically reach these towns by bus or train (depending on the specific service and bike carriage policies) and then connect to the extensive network of traffic-free gravel paths along the canals and rivers. It's advisable to check local public transport schedules and bike policies in advance.
Generally, dogs are welcome on many of the public paths and greenways in the region, especially if kept on a leash. The traffic-free nature of these gravel trails makes them safer for pets. However, it's always best to observe local signage and regulations, particularly in nature reserves or specific protected areas, to ensure a pleasant experience for everyone.


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