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Routes
Bike touring routes & trails
France
Pays de la Loire
Saint-Nazaire
Prinquiau

Observatoire le Rocher – Marais du Syl Observatory loop from Prinquiau

Routes
Bike touring routes & trails
France
Pays de la Loire
Saint-Nazaire
Prinquiau

Observatoire le Rocher – Marais du Syl Observatory loop from Prinquiau

Easy

3.5

(2)

5

riders

Observatoire le Rocher – Marais du Syl Observatory loop from Prinquiau

01:49

28.5km

60m

Cycling

Easy bike ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: June 28, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc naturel régional de Brière

Waypoints

A

Start point

Bus stop

Get Directions

1

8.37 km

Marsh crossing

Highlight • Other

2

9.50 km

Observatoire le Rocher

Highlight • Other

Allows you to observe the surrounding flora and fauna

Translated by Google •

Tip by

3

11.1 km

Marais du Syl Observatory

Highlight • Viewpoint

Allows you to observe the surrounding flora and fauna

Translated by Google •

Tip by

4

15.7 km

The Port House

Highlight • Cafe

This beautiful residence, which currently houses a crêperie, served as a model for the Maison dans la Loire, a work that can be seen in Couëron.
The small port in …

Translated by Google •

Tip by

5

15.8 km

Lavau-sur-Loire

Highlight • Other

The old Saint-Martin du Sillon church has been listed as a historical monument since 1984.
Several beautiful old houses around this small town center.

Translated by Google •

Tip by

6

17.4 km

Trou Bleu Viewpoint

Highlight • Viewpoint

Recently inaugurated, this new Loire viewpoint was built on the rocky promontory overlooking one of the ponds. It is accessed via a staircase carved into the rock, so bicycles must …

Translated by Google •

Tip by

7

17.7 km

The Blue Hole

Highlight • Structure

Three old granite quarries, abandoned in 1980, which naturally filled with water to form beautiful blue ponds, popular with fishermen. Many of the cobblestones of Nantes and Nazaire streets come from this place.

Translated by Google •

Tip by

B

28.5 km

End point

Bus stop

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Way Types & Surfaces

Way Types

16.1 km

8.99 km

1.82 km

873 m

567 m

112 m

Surfaces

16.3 km

5.05 km

4.38 km

2.75 km

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Elevation

Elevation

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

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Weather

Powered by Foreca

Thursday 2 July

31°C

14°C

0 %

Additional weather tips

Max wind speed: 12.0 km/h

to get more detailed weather forecasts along your route

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

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