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Kerdiston lake – The Glomel Cut loop from Glomel

Routes

Running trails & routes

Kerdiston lake – The Glomel Cut loop from Glomel

Hard

runners

Kerdiston lake – The Glomel Cut loop from Glomel

02:16

19.7km

170m

Running

Hard run. 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: July 9, 2026

Waypoints

Start point

Bus stop

Get Directions

4.18 km

Étang du Coroncq

Lake

10.9 km

Pont Yannick Lock on the Nantes–Brest Canal

Highlight • Other

The old lock keeper's house has been converted to a private home, but well maintained.

Tip by

12.4 km

Étang de Trébel

Lake

12.8 km

Kerdiston lake

Highlight • Lake

The dams for the Canal de Nantes à Brest create a lake from the waters of a little stream, the bike trail passes on the back of the levy

Tip by

13.0 km

Great Trench of the Nantes to Brest Canal

Highlight • Monument

At an altitude of 184 m, the Glomel trench is the highest point of the Nantes-Brest canal and the watershed between the Blavet and Aulne basins. The canal project and its passage through the center of Brittany dates back to Vauban, the decision and the route to Napoleon. The impressive trench allows the Aulne and Blavet watersheds to communicate via the canal.
The Grande Trenche of the Canal from Nantes to Brest was dug in the 19th century by deserters from the army of Louis XVIII. The 4000 convicts of Glomel had to move as much earth and rock as was necessary for the construction of a great pyramid in Egypt. It took 9 years to create this trench, more than 3 kilometers long, 100 meters wide and 23 meters deep.

Translated by Google •

Tip by

13.6 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 to build the largest pyramid in Egypt!

The work was carried out in the 19th century by deserters imprisoned and sentenced to forced labor. Many did not survive the unimaginable working and hygienic conditions.

A book “Les Bagnards du canal de Nantes à Brest” traces the little-known history of the builders of the canal from Nantes to Brest.

Translated by Google •

Tip by

19.7 km

End point

Bus stop

Way Types & Surfaces

Way Types

9.87 km

5.62 km

3.16 km

978 m

< 100 m

Surfaces

9.76 km

3.09 km

2.66 km

2.16 km

1.97 km

< 100 m

Elevation

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

Highest point (240 m)

Lowest point (180 m)

Weather

Thursday 9 July

33°C

19°C

0 %

Additional weather tips

Max wind speed: 16.0 km/h

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Kerdiston lake – The Glomel Cut loop from Glomel

Pont Yannick Lock on the Nantes–Brest Canal

Kerdiston lake

Great Trench of the Nantes to Brest Canal

The Glomel Cut

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