Tips
Fabrice Rigalleau
March 23, 2026
Road cycling
An ancient feudal fortress, the castle of Derval was considered in its time as one of the strongholds of the Marches of Brittany with its 9 towers. After experiencing prestigious sieges, including that of Du Guesclin, in 1598, it would fall under the axe of the Edict of Nantes which condemned it to demolition. The only remnant, the old keep, renamed Tour Saint-Clair and giving its name to the castle, still resists and bears witness today to the history of the castle known since the 11th century.
Showing Translation•
In the know? Log-in to add a tip for other adventurers!
Sign up for free
Nearby routes
Best routes near Château Saint Clair
24
riders
113km
04:53
880m
880m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
Moderate
10
riders
186km
08:16
1,460m
1,460m
Hard road ride. Very good fitness required. Some segments of this route may be unpaved and difficult to ride.
Hard
4.0
(3)
8
riders
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
Moderate
Details
Informations
Elevation 50 m