The Blue Hole – The Port House loop from Prinquiau

Bike touring routes & trails

The Blue Hole – The Port House loop from Prinquiau

Moderate

5.0

(2)

riders

The Blue Hole – The Port House loop from Prinquiau

02:45

46.7km

140m

Cycling

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

Last updated: August 2, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc naturel régional de Brière

Waypoints

Start point

Bus stop

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7.90 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.

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8.16 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 …

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9.78 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 …

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9.94 km

Lavau-sur-Loire

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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.

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21.5 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.

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22.0 km

Port of Cordemais

Highlight • Structure

Very relaxing, quiet place, ideal for a stopover (especially the nearby guiguette)

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25.5 km

Marais de la Roche

Highlight • Other

A 335-hectare marsh located just north of Cordemais. This marsh is mostly flooded between November and March, with water levels that can make some paths impassable. You can see many …

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32.1 km

Église Notre-Dame-de-l'Immaculée-Conception de Bouée

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This small church is actually an extension of a 14th-century chapel, which is believed to be the current sacristy. The church in its present form was reportedly completed in 1606 …

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46.7 km

End point

Bus stop

Way Types & Surfaces

Way Types