Lake Guerlédan, Artificial lake in Brittany, France
Lake Guerlédan is a reservoir in central Brittany that stretches 12 kilometers (7.5 miles) between Morbihan and Côtes-d'Armor. The water covers a former slate valley and now forms the largest artificial lake in the region.
Construction of the dam took place between 1923 and 1930, submerging 17 locks of the Nantes-Brest canal. The project transformed the valley into a reservoir that now serves power generation and recreation.
The Abbaye de Bon-Repos, established in 1184 near the lake shores, maintains its architectural legacy through continuous restoration efforts by dedicated local craftspeople.
Several beaches and coves around the water allow swimming, while marked zones support water skiing, kayaking, and paddle boarding. Footpaths follow the shoreline and give access to viewpoints and shaded rest areas.
A complete drainage in 2015 exposed submerged locks and buildings from the canal era. Visitors walked through the dry riverbed and viewed structures preserved since before the dam was built.
Location: Saint-Aignan
Location: Sainte-Brigitte
Elevation above the sea: 121 m
Address: Lake Guerlédan, 56480 Saint-Aignan, France
Website: http://lacdeguerledan.com
GPS coordinates: 48.20417,-3.05000
Latest update: December 20, 2025 13:57
Bench
2.7 kmSaint-Aignan (De)
2.1 kmÉcluse de Saint-Gelven
2.7 kmÉcluse de Pouldu
1.3 kmÉcluse de Toul Houët
3 kmÉcluse de Toul er Lann
2.7 kmÉcluse de Tregnanton
773 mÉcluse de Malvran
2.6 kmÉcluse Les Longeaux
3.7 kmÉcluse de Kergoff (n°123)
2 kmÉcluse de Cosquer
1.2 kmÉcluse de Kermadec
557 mÉcluse de Baraval
257 mÉcluse les Granges
3.3 kmÉcluse de Castel Finance
2.7 kmÉcluse des Forges
4.4 km
Chapelle Sainte-Tréphine de Saint-Aignan
2.3 kmÉcluse de Zelo
2.6 kmÉcluse de Caurel
2.2 kmScenic viewpoint
2.3 kmScenic viewpoint
711 mScenic viewpoint
2.4 kmScenic viewpoint
2.6 kmScenic viewpoint
2.2 kmScenic viewpoint
1.5 kmLac de Guerledan - Point de vue du Rond-point du lac
2.8 kmScenic viewpoint
2.7 kmScenic viewpoint
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