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The Stone Bridge – Port of La Madelon loop from Groffliers

Routes

Bike touring routes & trails

The Stone Bridge – Port of La Madelon loop from Groffliers

Moderate

5.0

(2)

riders

The Stone Bridge – Port of La Madelon loop from Groffliers

02:27

38.6km

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: July 23, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc naturel marin des Estuaires picards et de la mer d'Opale

Parc naturel régional Baie de Somme Picardie Maritime

Waypoints

Start point

Parking

Get Directions

3.66 km

Waben - Foraine d'Authie

Highlight • Other

Northern access to the old sand and gravel mines that created the large lakes today teeming with nature and wildlife. The site of the Foraine d'Authie is made up of …

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5.37 km

Foraine d'Authie

Highlight • Other

The site of the Foraine d'Authie is made up of a series of bodies of water resulting from the exploitation of old ridges of pebbles. This former quarry, in the …

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18.6 km

Avocette bike route – Trail access to the sea

Highlight • Cycleway

The bike route follows the paved road. At this trailhead a sandy trail heads for the sea, but is too soft to ride by bike

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20.4 km

Parc du Marquenterre

Highlight • Natural

At the crossroads of dunes, marshes, and pine forests, the Marquenterre Park is a 260-hectare natural sanctuary, in the heart of the Baie de Somme.

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20.8 km

Return trip Le crotoy Quend via cycle paths

Highlight • Other

34.1 km

The La passerelle de l'Authie, inaugurated in April 2022, is a 52-meter-long pedestrian and cycle structure that facilitates the safe crossing of the Authie river. Connecting the departments of Somme …

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35.4 km

Authie Bay

Highlight • Other

This is the little sister of the Baie de Somme, classified as a Grand Site de France. You will see a genetic similarity when you walk/cycle along the Baie d’Authie! …

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37.4 km

Port of La Madelon

Highlight • River

Once flourishing under the protection of Waben Castle, the port of Madelon, with its medieval Berck fishing fleet, evolved into a marina due to the siltation of Authie Bay. Today, …

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38.6 km

End point

Parking

Way Types & Surfaces

Way Types

15.9 km

9.89 km

8.98 km

3.28 km

571 m

< 100 m

Surfaces

17.2 km

12.1 km

7.00 km

2.01 km

300 m

Elevation

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

Weather

Tuesday 11 August

33°C

16°C

0 %

Additional weather tips

Max wind speed: 18.0 km/h

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The Stone Bridge – Port of La Madelon loop from Groffliers

Waben - Foraine d'Authie

Foraine d'Authie

Avocette bike route – Trail access to the sea

Parc du Marquenterre

Return trip Le crotoy Quend via cycle paths

The Stone Bridge

Authie Bay

Port of La Madelon

Nearby routes

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