Best lakes around Fort-Mahon-Plage are situated in a coastal region characterized by its extensive sandy beaches and the significant Baie d'Authie estuary. While large natural lakes are not a primary feature, the area offers diverse aquatic environments. The Grand Lac, located within the Village Pierre & Vacances Belle Dune, provides a central point for water-based recreation and family-friendly activities. Visitors can find various walking routes and opportunities to explore the natural areas around Fort-Mahon-Plage.
Last updated: July 7, 2026
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Popular around Fort-Mahon-Plage
I, who am not one for holiday villages, found this one really pretty and well maintained, in a beautiful, quiet setting.
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View of the lake and the holiday village.
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However, cycling is prohibited here!
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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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The chalet's motte pond is a small pond surrounded by trees and flowers, where you can enjoy the tranquility of nature. The trail takes you to a viewpoint that offers panoramic views of the bay and dunes. You can admire the beauty of the landscape and breathe the fresh sea air.
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The chalet motte pond is a small pond surrounded by trees and flowers, where you can enjoy the tranquility of nature. The trail takes you to a viewpoint that offers panoramic views of the bay and dunes. You can admire the beauty of the landscape and breathe the fresh sea air.
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The car-free Ecological Holiday Park Belle Dune is located in a protected environment 2 km from the sea and is truly an oasis of peace. The holiday park consists of colored buildings with Picardy influences, spread over 6 districts. The pastel colors in the interior of our holiday homes and apartments exude peace and relaxation. Residents of the Maisons de la Plage district can enjoy a heated indoor swimming pool a stone's throw from their accommodation.
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Residential community around a lake behind the dunes
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While Fort-Mahon-Plage is known for its beaches, the area features diverse aquatic environments. You'll find man-made lakes within holiday resorts, such as the Grand Lac at Village Pierre & Vacances Belle Dune, offering recreational activities. Additionally, there are natural ponds like La Mare du Chalet Motte, and the significant Baie d'Authie estuary, which provides a rich natural habitat for wildlife.
Yes, the Grand Lac within the Village Pierre & Vacances Belle Dune is particularly family-friendly. During July and August, you can enjoy activities like pedal boating and Hobie Cat sailing directly on the lake. The nearby Aquaclub also offers pools and slides, making it a comprehensive leisure destination for families. The The Grand Lake - Belle Dune area is part of a car-free Ecological Holiday Park, providing a peaceful environment.
The area is rich in natural beauty. At La Mare du Chalet Motte, you'll find a small pond surrounded by trees and flowers, with a viewpoint offering panoramic views of the bay and dunes. The Foraine d’Authie Observatory, formed from old pebble cords, is a haven for birdwatching, where you can spot species like Spoonbills, Cormorants, and Avocets.
You can enjoy various outdoor activities. For walking and running, explore routes around La Mare du Chalet Motte or the Grand Lac - Belle Dune. Cycling is popular, with bike paths through pine forests connecting to areas like Quend and the Parc du Marquenterre. You can find more detailed routes for running, gravel biking, and MTB in the area by visiting the respective guides: Running Trails around Fort-Mahon-Plage, Gravel biking around Fort-Mahon-Plage, and MTB Trails around Fort-Mahon-Plage.
Yes, there are marked trails for exploration. For instance, a trail around La Mare du Chalet Motte leads to a viewpoint with panoramic bay and dune views. The Baie d'Authie also offers marked trails for exploring its unique ecosystem. For a longer run, consider the moderate 10.9 km loop from Fort-Mahon-Plage around La Mare du Chalet Motte.
For water-based recreational activities like pedal boating and Hobie Cat sailing on the Grand Lac, July and August are ideal. Sailing lessons are available from late March to early November. For nature observation and walking, the spring and autumn months offer pleasant weather and opportunities to see migratory birds in the Baie d'Authie.
Absolutely. The Baie d'Authie, while an estuary, is a significant natural water body near Fort-Mahon-Plage and is a haven for wildlife. It's home to a colony of harbor and grey seals, often spotted at low tide. The wider Baie de Somme area boasts over 400 species of birds. The Foraine d’Authie Observatory is specifically designed for birdwatching, where you can see Spoonbills, Cormorants, and more.
Visitors often highlight the tranquility and well-maintained settings. The Main lake of the holiday resort (Grand Lac) is noted for its beautiful, quiet environment. The car-free nature of the Ecological Holiday Park around The Grand Lake - Belle Dune also contributes to a peaceful experience, allowing for relaxation and enjoyment of nature.
Yes, the area around the Grand Lac within the Belle Dune holiday village features bike paths that lead through pine forests to nearby areas like Quend and the Parc du Marquenterre. You can also find various cycling routes, including gravel biking and mountain biking trails, that incorporate views of the aquatic environments. For specific routes, refer to the Gravel biking around Fort-Mahon-Plage and MTB Trails around Fort-Mahon-Plage guides.
The Baie d'Authie is an estuary, not a freshwater lake, but it's a significant aquatic environment bordering Fort-Mahon-Plage. It offers a wild landscape of dunes, wetlands, and salt marshes, changing with the tides. It's ideal for nature lovers, birdwatchers, and hikers, with opportunities for guided outings and pony treks to discover its unique flora and fauna, including a seal colony.
For a more tranquil experience, La Mare du Chalet Motte offers a small, peaceful pond surrounded by trees and flowers, where you can enjoy the quiet of nature away from more bustling areas. The Foraine d’Authie Observatory also provides a serene setting for observing birds in a natural, recolonizing environment.


Still not found your perfect lake around Fort-Mahon-Plage? Check out the guides of these regions to see even more beautiful places.