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Arzal Dam – Port Tréhiguier loop from Marzan

Arzal Dam – Port Tréhiguier loop from Marzan

Moderate

4.0

(2)

riders

Arzal Dam – Port Tréhiguier loop from Marzan

02:08

47.5km

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 accessible with public transport.

Last updated: June 20, 2026

Tips

Includes a segment in which cycling is not permitted

After 17.1 km for 85 m

Waypoints

Start point

Bus stop

Get Directions

2.49 km

Gentle bends on the D148 between Arzal and Marzan

Highlight (Segment) • Other

9.11 km

Arzal Dam

Highlight • Monument

The Arzal dam is built on the Vilaine estuary between Arzal and Camoël. It is the largest estuary dam in Europe. It is 500 meters long and has a sea …

Translated by Google •

Tip by

16.9 km

The annex at the Port of Tréhiguier

Highlight • Other

It's a very nice place by the sea, with a wide choice of wines, beers and cocktails from all over the world. The café opens every day at 7:30 am …

Translated by Google •

Tip by

16.9 km

Billiers

Highlight • Settlement

16.9 km

Port Tréhiguier

Highlight • Structure

Small charming harbor overlooking the Vilaine estuary. Some very nice restaurants and bars for a mid-term coffee or to fill your cans!

Translated by Google •

Tip by

17.1 km

Tréhiguier Lighthouse

Highlight • Monument

Adjoining its port, the Tréhiguier lighthouse is a former semaphore, erected in 1880 then closed in 1989. Today, it is open to the public during the summer and hosts numerous …

Translated by Google •

Tip by

42.8 km

Old Port of La Roche-Bernard

Highlight • Settlement

The stones, weathered by time, and the steep alleyways tell the story of this "Small Town of Character," born of the sea and maritime trade. Clinging to the banks of …

Translated by Google •

Tip by

47.5 km

End point

Bus stop

Way Types & Surfaces

Way Types

39.7 km

2.99 km

2.76 km

1.66 km

252 m

166 m

Surfaces

41.0 km

6.12 km

304 m

136 m

< 100 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (60 m)

Lowest point (0 m)

Weather

Tuesday 21 July

29°C

13°C

0 %

Additional weather tips

Max wind speed: 19.0 km/h

to get more detailed weather forecasts along your route

Comments

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Arzal Dam – Port Tréhiguier loop from Marzan

Gentle bends on the D148 between Arzal and Marzan

Arzal Dam

The annex at the Port of Tréhiguier

Billiers

Port Tréhiguier

Tréhiguier Lighthouse

Old Port of La Roche-Bernard

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