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Marais de Lyarne – Port du Collet loop from La Bernerie-en-Retz

Marais de Lyarne – Port du Collet loop from La Bernerie-en-Retz

Moderate

4.3

(4)

106

riders

Marais de Lyarne – Port du Collet loop from La Bernerie-en-Retz

01:58

41.5km

80m

Road cycling

Moderate road ride. Great for any fitness level. Some segments of this route may be unpaved and difficult to ride. The starting point of the route is accessible with public transport.

Last updated: July 25, 2026

Tips

The surface along some of this route may not be suitable

Some segments of your route comprise a surface that may not be suitable for your chosen sport.

After 18.3 km for 1.33 km

After 20.1 km for 223 m

After 25.6 km for 1.24 km

After 35.7 km for 90 m

Waypoints

Start point

Train Station

Get Directions

947 m

Maurice Giros Pond Beach

Highlight • Beach

Body of water very practical when the beach is at low tide

Translated by Google •

Tip by

4.06 km

Facing south, Pré-Vincent beach is cut by numerous groynes of wood or rocks. At low tide, the sea retreats several kilometers and gives way to the famous mud from the Bay of Bourgneuf. Near the town center of Moutiers en Retz, the beach is bordered by a promenade exclusively reserved for pedestrians. Pretty silted walk when I hiked it.

Translated by Google •

Tip by

6.09 km

Marais de Lyarne

Highlight • Other

The Lyarne marsh, Natura 2000 site, is a former salt marsh with dunes and reedbeds. It is a haven of peace for birds and horses.

Translated by Google •

Tip by

9.14 km

Port of Collet

Highlight • Other

For centuries, the port of Collet was the main point of departure for the export of salt produced in the salt marshes of the coast. At the end of the 15th century, more than 200 ships loaded in the bay of Bourgneuf (then known as “bay of Brittany”). Gradually, the siltation of the bay causes the end of the activity.
Thanks to a lock built in 1879 which regulates the waters of the Marais and those of the sea, the port's activity can continue around oyster farming and yachting.

Translated by Google •

Tip by

9.69 km

Port du Collet

Highlight • Other

Water management is essential for life in the swamp, it is managed by the SAH. (Syndicate of the Southern Loire Hydraulic Development). 51 municipalities are affected by the regulation of these waters by the Marais Breton Vendée or Marô. There are still 3 main locks in Port la Roche and 2 in Fresne.

Translated by Google •

Tip by

20.9 km

Port de la Louippe

Highlight • Other

A tortuously picturesque and totally wild little oyster port, it is a refuge appreciated by all boaters. It is crossed by the cycle path of the Breton marshes going from the port of Collet to the passage of Gois and accessible by a tarmac road. It is essentially a beaching port that is passable at high tide and very well sheltered from the westerly winds. On the other side of the lock, there are a few marsh “Fisheries”, wooden constructions allowing the practice of plaice fishing.

Translated by Google •

Tip by

41.5 km

End point

Train Station

Way Types & Surfaces

Way Types

30.6 km

3.95 km

3.83 km

3.06 km

< 100 m

Surfaces

30.5 km

7.46 km

1.57 km

1.06 km

655 m

184 m

Elevation

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

Weather

Sunday 2 August

26°C

18°C

14 %

Additional weather tips

Max wind speed: 20.0 km/h

to get more detailed weather forecasts along your route

Comments

December 20, 2025,Cyclisme groupe 1 fin de circuit depuis le port aux Brochets à Bouin

My Garmin turned off due to a low battery, so I switched to Komoot to record the end of the ride. That's to be expected, starting with only 12% battery charge...

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Marais de Lyarne – Port du Collet loop from La Bernerie-en-Retz

Maurice Giros Pond Beach

Pré Vincent Beach

Marais de Lyarne

Port of Collet

Port du Collet

Port de la Louippe

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