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Routes
France
Pays de la Loire
Saint-Nazaire
Malville

Marais du Syl Observatory – Observatoire le Rocher loop from Loire-Atlantique

Routes
France
Pays de la Loire
Saint-Nazaire
Malville

Marais du Syl Observatory – Observatoire le Rocher loop from Loire-Atlantique

Hard

5.0

(2)

13

riders

Marais du Syl Observatory – Observatoire le Rocher loop from Loire-Atlantique

05:26

87.9km

500m

Gravel riding

Hard gravel 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: March 9, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Parc naturel régional de Brière

Waypoints

A

Start point

Bus stop

Get Directions

1

34.8 km

Château de l'Escuray

Highlight • Castle

2

44.6 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 •

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3

46.3 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 •

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4

46.5 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 •

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5

51.7 km

Marais du Syl Observatory

Highlight • Viewpoint

Allows you to observe the surrounding flora and fauna

Translated by Google •

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6

53.3 km

Observatoire le Rocher

Highlight • Other

Allows you to observe the surrounding flora and fauna

Translated by Google •

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7

69.7 km

Cordemais Estuary Observatory

Highlight • Viewpoint

This observatory offers a clear view of the Cordemais channel, the Loire, the "Maison Cheminée" (Chimney House), and the magnificent coal-fired power station. A pleasant walk through the wetland area is also available. There are also picnic tables.

Translated by Google •

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8

70.3 km

The port of Cordemais is a blatant manifestation of the town's deep attachment to its estuary. Redeveloped in 2008, the site now offers more pitches and an ecological fairing area, …

Translated by Google •

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B

87.9 km

End point

Bus stop

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Way Types & Surfaces

Way Types

52.4 km

29.7 km

2.94 km

2.83 km

< 100 m

< 100 m

Surfaces

33.9 km

30.1 km

20.4 km

3.08 km

497 m

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Elevation

Elevation

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

Highest point (90 m)

Lowest point (0 m)

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Weather

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Tuesday 26 May

33°C

17°C

0 %

Additional weather tips

Max wind speed: 14.0 km/h

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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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