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View of Lac au Duc – Duke's Lake loop from Saint-Marcel

View of Lac au Duc – Duke's Lake loop from Saint-Marcel

Moderate

riders

View of Lac au Duc – Duke's Lake loop from Saint-Marcel

02:19

52.9km

370m

Road cycling

Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride. The starting point of the route is right next to a parking lot.

Last updated: June 19, 2026

Tips

Includes a segment in which cycling is not permitted

After 32.5 km for 82 m

Waypoints

Start point

Parking

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9.24 km

Nantes–Brest Canal - Oust Quay

Highlight • Other

Domaine du Roc campsite

Translated by Google •

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9.29 km

Le Roc-Saint-André

Highlight • Settlement

Quaint village with an ancient church on a hill overlooking a bend in the river & Canal de Nantes à Brest.

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20.4 km

Created by monks in the 12th century, Lac au Duc is the largest of Brittany's inland lakes. Its 250 hectares extend between Ploërmel, Taupont and Loyat.

Measuring approximately 5.5 km by 500-900 m, Lac au Duc is surrounded by a variety of different natural habitats and wetlands. If you look carefully, you might be lucky enough to see otters, frogs or deer.

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25.7 km

Wooden boardwalk on the shore of Lac au Duc

Highlight • Trail

29.5 km

View of Lac au Duc

Highlight • Lake

It is one of the largest lakes in Brittany with a length of 5.5 kilometers and a width of between 500 and 900 meters depending on the location. Lake Ploërmel constitutes a habitat of choice for many aquatic and terrestrial species. Otters, frogs, deer, white fish and insects benefit from this space fed by the Yvel.

Botany lovers will appreciate the Hydrangea circuit which runs for three kilometers, while running enthusiasts and cyclists take the path which goes around the lake. On the west bank, the water sports center offers a range of sailing or rowing sports, just a stone's throw from the beach.

Translated by Google •

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