4.2
(94)
372
riders
59
rides
Mountain biking in Forêt De La Groulaie offers a diverse landscape characterized by dense woodlands and proximity to the Canal de Nantes à Brest. The region features a network of trails suitable for various skill levels, with gentle elevation changes across its forested terrain. This natural site near Blain provides a mix of dedicated mountain bike trails and scenic paths along the canal, making it a suitable destination for outdoor enthusiasts.
Last updated: May 7, 2026
4.7
(3)
4
riders
38.8km
02:36
150m
150m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.2
(6)
11
riders
27.4km
01:43
70m
70m
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.

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5.0
(1)
10
riders
19.6km
01:05
40m
40m
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
4
riders
20.7km
01:11
70m
70m
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
6
riders
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
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A friendly place for a break with a pleasant view
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This is lock number 11. On the other bank you can admire the Groulaie forest.
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Beautiful medieval castle. The main building is more recent. As a side note, the Isac River fed the castle's imposing moats, now dry, before being channeled to the current marina.
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The Monkey Bike Bar is a must-see place (Bar) on the Nantes-Brest canal! ideally located on the port of Blain with a terrace to quench your thirst with a nice view! Plus there is a bike shop behind the bar (Cycles riflet). Don’t hesitate to stop by! schedules available on Google and social networks, depending on the seasons.
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Located at the exit of the town of Blain, just next to the Nantes-Brest canal, this old medieval fortress invites you to walk in the footsteps of its prestigious guests such as the King of France Henry II, Queen Catherine de Medici or Duchess Anne of Brittany.
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Good spot to refuel. Toilets and water, which is rare despite the announcements of signs and tourist offices.
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The Château de la Groulais was the largest fortress in the region at the time and was the home of several personalities, including Olivier V de Clisson and Marie Bonaparte, etc.
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The Château de la Groulais, or Blain, is a medieval fortress located in the town of Blain, in Loire-Atlantique. Built in the 12th century by the Duke of Brittany Alain Fergent, then enlarged in the 13th century by the constable Olivier I de Clisson, and heavily remodeled in the 16th century in the Renaissance style, it was part of the defenses of the Franco-Breton border with the castles of Vitré, Fougères, Châteaubriant, Ancenis and Clisson.
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Forêt De La Groulaie offers a diverse network of mountain bike trails, ranging from easy to moderate, with a few more challenging options. The terrain primarily features dense woodlands and scenic paths alongside the Canal de Nantes à Brest. You'll find routes with gentle elevation changes, making them accessible for various skill levels.
Yes, Forêt De La Groulaie has numerous trails perfect for beginners. Nearly half of the 58 available routes are rated as easy. An example of an easy route is the Mountainbike loop from Blain, which is 10.7 miles (17.1 km) long and features minimal elevation gain.
While mountain biking, you can explore the dense woodlands of the Forêt De La Groulaie itself and ride alongside the picturesque Canal de Nantes à Brest. A notable historical landmark is the 12th-century Château de la Groulais (Château de Blain), a medieval fortress that adds a cultural dimension to your ride. The canalized Isac River and its locks, such as Écluse n°11, also offer scenic views.
While specific parking areas aren't detailed in the guide, the town of Blain, adjacent to the forest, is a common starting point for many routes. It's advisable to look for public parking options within Blain or near popular trailheads like those along the Canal de Nantes à Brest.
The Forêt De La Groulaie can be enjoyed for mountain biking throughout much of the year. Spring and autumn offer pleasant temperatures and beautiful foliage. Summer is also suitable, though it can be warmer. Winter rides are possible, but trails might be muddier, especially after rain.
Yes, many of the trails in Forêt De La Groulaie are suitable for families, particularly the easier routes with gentle terrain and minimal elevation. The paths along the Canal de Nantes à Brest are generally flat and scenic, making them ideal for a family outing. Consider routes like the Lock 11 — La Prée loop from Blain for a relatively short and easy ride.
The area is highly rated by the komoot community, with an average score of 4.3 stars from over 80 reviews. Mountain bikers often praise the varied terrain, the peaceful atmosphere of the dense woodlands, and the scenic stretches along the Canal de Nantes à Brest. The presence of historical sites like the Château de la Groulais also adds to the appeal.
Yes, the region supports cycling enthusiasts. Notably, the "Monkey Bike Bar" with an integrated bike shop, "Cycles riflet," is conveniently located on the Canal de Nantes à Brest near the forest. This provides services like repairs and refreshments, making it a great stop during or after your ride.
The mountain bike trails in Forêt De La Groulaie vary significantly in length. You can find shorter loops, such as the Mountainbike loop from Blain at 10.7 miles (17.1 km), up to much longer routes like the Lock 11 — La Prée – Tindière Lock loop from Plongeon, which spans over 50 miles (83.5 km).
While the guide doesn't specify dog-friendly policies for every trail, natural sites like Forêt De La Groulaie generally welcome dogs, especially on forest paths and canal towpaths, provided they are kept under control. It's always best to check local signage or regulations for specific areas within the forest to ensure compliance.
Yes, many of the mountain bike routes in Forêt De La Groulaie are designed as circular loops, allowing you to start and finish at the same point. Examples include the popular Le Monkey Bike Bar – Lock 11 — La Prée loop from Blain and the Château de la Groulais – Lock 11 — La Prée loop from Blain.


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