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France

Pays de la Loire

Châteaubriant-Ancenis

Nort-Sur-Erdre

Lock 11 — La Prée – Château de la Groulais loop from Circuit de l'écluse du Pas d'Héric

Routes

Bike touring routes & trails

France

Pays de la Loire

Châteaubriant-Ancenis

Nort-Sur-Erdre

Lock 11 — La Prée – Château de la Groulais loop from Circuit de l'écluse du Pas d'Héric

Moderate

4.9

(46)

222

riders

Lock 11 — La Prée – Château de la Groulais loop from Circuit de l'écluse du Pas d'Héric

02:26

37.8km

50m

Cycling

Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: May 21, 2026

Tips

Cycling is not permitted along parts of this route

After 18.6 km for 301 m

After 19.0 km for 301 m

Waypoints

Start point

Parking

Get Directions

730 m

Pas d'Héric Lock on the Nantes to Brest Canal

Highlight • Structure

This is lock number 6 coming from Nantes

Translated by Google •

Tip by

3.30 km

Innovative Rest Area

Highlight • Rest Area

a railing to lean your bike on, a seat and even a lying area or picnic area.
I have never found anything like that in Germany, and here you can find it every few kilometers.

Translated by Google •

Tip by

5.65 km

L'Isac dam on the Nantes-Brest canal

Highlight • Other

The canal offers very beautiful walks accessible to everyone with small more technical passages such as "the single hidden" near the dike. Opposite the end of wood beach is very nice too.

Translated by Google •

Tip by

10.7 km

Canal de Nantes à Brest

Lake

14.0 km

Terrier Lock

Highlight • Other

Lock number 10. Very friendly welcome at the lock house, which offers drinks, ice creams, etc. And the terrace under the trees is really nice.

Translated by Google •

Tip by

17.2 km

Lock 11 — La Prée

Highlight • Structure

A lock among others? No, because here you can have your bike repaired! This repair workshop is ideal because it is located along the Vélodyssée.

Translated by Google •

Tip by

18.9 km

Château de la Groulais

Highlight • Castle

The Château de la Groulais was the largest fortress in the region at the time and was the home of several personalities, including Olivier V de Clisson and Marie Bonaparte, etc.

Translated by Google •

Tip by

31.2 km

View of the Isac dam and the Nantes-Brest canal from Bout du Bois

Highlight • Viewpoint

This passage runs along several hundred meters of the dike which separates the Isac river from the Nantes-Brest canal. Always nice to see two rivers side by side.
The surroundings are very quiet and with shade if necessary.

Translated by Google •

Tip by

32.0 km

Covered rest areas - great!

Highlight • Other

We have already passed by such covered rest areas several times.
The grass is even cut here.
Rain (if the metal roof is still there) can't harm it.

Translated by Google •

Tip by

37.8 km

End point

Parking

Way Types & Surfaces

Way Types

30.4 km

4.62 km

2.06 km

498 m

168 m

< 100 m

Surfaces

28.6 km

5.82 km

2.05 km

1.13 km

168 m

Elevation

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

Weather

Friday 10 July

39°C

23°C

33 %

Additional weather tips

Max wind speed: 26.0 km/h

to get more detailed weather forecasts along your route

Comments

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Lock 11 — La Prée – Château de la Groulais loop from Circuit de l'écluse du Pas d'Héric

Pas d'Héric Lock on the Nantes to Brest Canal

Innovative Rest Area

L'Isac dam on the Nantes-Brest canal

Terrier Lock

Lock 11 — La Prée

Château de la Groulais

View of the Isac dam and the Nantes-Brest canal from Bout du Bois

Covered rest areas - great!

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