Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: January 25, 2026

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Waypoints

Start point

Bus stop

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25.3 km

Guernal lock on the Nantes-Brest canal

Highlight • Other

The Guernal lock is located in the town of Neulliac. It was built around the 1800s and is accompanied by several buildings (houses, stores, bridges over locks) whose restoration has not been completed.

Translated by Google •

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27.5 km

Cascade Lock

Highlight • Bridge

Just before arriving in Pontivy the river Blavet crashes down a wide cascade, while the canal is channelled left through a lock. Pedestrians and bikers can cross the narrow metal …

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39.1 km

Stumo lock on the Nantes-Brest canal

Highlight • Other

The locks at this location with the keeper's house midstream were probably also serving as a mill to harness the water power from the main Blavet river channel.

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46.6 km

Guerlédan Lock - Nantes to Brest Canal

Highlight • Monument

Last locks before reaching the barrage

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61.1 km

Lock No. 138 of Bon Repos

Highlight • Bridge

The 18th century canal lock has been shaped like a medieval bridge fitting to the old Abby, with a hostel in the old canal keeper's house, and a café on the opposite side from the Abby.

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69.7 km

Plélauff lock on the Nantes–Brest Canal

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One of the many locks on the canal near the village of Pléalauff. Just after, the bridge allowing you to cross the canal and reach the wash house. All on the Vélodyssée route.

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85.1 km

Path between two bodies of water on the Nantes-Brest Canal

Highlight • Trail

A stretch on the dam before the Trehu Moron dam.
The landscape is constantly changing. The canal meanders through the countryside here.
I love this landscape, and it's a good mood to drive here.

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135 km

The Glomel Cut

Highlight (Segment) • Monument

This passage is the highest point of the canal. It was necessary to dig three million cubic meters of earth and rock to make the canal pass: as much as …

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137 km

Étang de Trébel

Lake

156 km

End point

Bus stop

Way Types & Surfaces

Way Types

91.2 km

42.5 km

15.9 km

3.58 km

3.25 km

< 100 m

Surfaces

91.0 km

45.9 km

15.7 km

3.67 km

176 m

Elevation

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

Highest point (260 m)

Lowest point (60 m)

Weather

Thursday 5 March

10°C

6°C

66 %

Additional weather tips

Max wind speed: 20.0 km/h

to get more detailed weather forecasts along your route

Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Cascade Lock – Lock No. 138 of Bon Repos loop from Langoëlan

Guernal lock on the Nantes-Brest canal

Cascade Lock

Stumo lock on the Nantes-Brest canal

Guerlédan Lock - Nantes to Brest Canal

Lock No. 138 of Bon Repos

Plélauff lock on the Nantes–Brest Canal

Path between two bodies of water on the Nantes-Brest Canal

The Glomel Cut

Nearby routes

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