Lac de Guerledan, Saint-Aignan

4.5
#4 of 15 in Nature in Morbihan
Lake Guerlédan is an artificial lake in the centre of Brittany, France. It extends across the borders of the departments of Morbihan and Côtes-d'Armor, within the communes of Saint-Aignan, Morbihan and Mûr-de-Bretagne. At an elevation of 121 m, its surface area is 4 km². Lake Guerlédan is the largest artificial lake in Brittany.

This Lake was created to power the dam of Guerlédan. Construction took seven years from 1923 to 1930, and encountered many geological, technical and financial difficulties. The creation of the lake and especially that of the dam cut the through the Nantes-Brest canal which from this location, followed the course of the river Blavet. Seventeen of the old locks on the canal were submerged in the Lake. Lake Guerlédan is now a tourist attraction, offering various watersports, walks and panoramic views.

During World War II, the Breton nationalist architect James Bouillé advocated a radical plan to build a new Breton capital city on the shores of Lake Guerlédan, to be called "Brittia". Bouillé believed this could be a "Celtic Brasilia".
Beginning in 1951, the Lake was regularly drained for repair, the last time being in 1985, revealing a hidden landscape of submerged locks and buildings. Modern technology will reduce this frequency but now (2015) the lake has been temporarily drained for the last time in a generation; new maintenance access is being installed so that the dam's hydro-electric system can be checked without the need to drain.
Make Lac de Guerledan a centerpiece of your Saint-Aignan vacation itinerary, and find what else is worth visiting using our Saint-Aignan online attractions planner.
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Lac de Guerledan Reviews

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TripAdvisor Traveler Rating 4.5
150 reviews
Google
4.5
TripAdvisor
  • We have visited Lac de Guerledan several times. The ferry trip around the lake is well worth the time and small cost. The restaurant has a varied menu, which has something for everyone and the small.....  more »
  • A stunning lake well worth a visit. Has a beach and water sports, boat trip and restaurant boat, paddle boarding and a ice cream shop and restaurants. Toilets and free parking. Very reasonable and.....  more »
Google
  • Amazing experience seeing the lake drained a few years back. It was fascinating to see the preserved trees, houses and reminants of slate mines. Also the cracked mud and little ecosystem that had managed to build up over the summer. Being on a pedalo on the lake a year earlier made it even more surreal.
  • Lucky to live 30 mins away, visit regular with dogs, no rush of city life here, just peace and tranquility paired with beautiful views.
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