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The Stone Bridge – Port of La Madelon loop from Fort-Mahon-Plage

Routes

Bike touring routes & trails

The Stone Bridge – Port of La Madelon loop from Fort-Mahon-Plage

Easy

4.3

(36)

226

riders

The Stone Bridge – Port of La Madelon loop from Fort-Mahon-Plage

01:37

28.4km

30m

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 21, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc naturel régional Baie de Somme Picardie Maritime

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

Waypoints

Start point

Bus stop

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6.47 km

The Stone Bridge

Highlight • Bridge

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 and Pas-de-Calais, it is part of the Eurocyclo project, which aims to enrich the cycling routes of the coast.

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8.32 km

Foraine d’Authie Observatory

Highlight • Viewpoint

The Foraine d’Authie site is made up of a series of bodies of water resulting from the exploitation of old pebble cords. This former quarry, in the process of being recolonized by the natural environment, has been the subject of recent ornithological developments (islets, mudflats, etc.), associated with grazing of all the meadows. These allow a large public to enjoy the discovery of the site and admire the Spoonbills, Cormorants, Black-headed Gulls, Avocets, Mergansers, etc., which occupy this natural space.

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8.69 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 process of being recolonized by the natural environment, has been the subject of recent developments for ornithological purposes (islets, mudflats, etc.), associated with the grazing of all the meadows. These allow a large public to enjoy the discovery of the site and to admire the Spoonbills, Cormorants, Mediterranean Gulls, Avocets, Mergansers, etc., which occupy this natural space.

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9.90 km

Gravel mining in Foraine d'Authie

Highlight • Other

Here you still see active exploitation of sand and gravel pits, an industry that created the large lakes today teeming with nature and wildlife. Given the value of the reserve for nature and tourism it is surprising this has not been stopped completely by now.

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10.4 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 a series of bodies of water resulting from the former exploitation of glacial pebble deposits. This former quarry, in the process of being recolonized by the natural environment, has been the subject of recent developments for ornithological purposes (islets, mudflats, etc.), associated with the grazing of the meadows. These allow a large public to enjoy the discovery of the site and to admire the Spoonbills, Cormorants, Mediterranean Gulls, Avocets, Mergansers, etc., which have repopulated this natural space.

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13.0 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, it has become a simple pontoon near a parking lot, but the setting remains very pleasant and the site is worth the detour!

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15.1 km