Lakes around Cayeux-Sur-Mer are primarily found in its vicinity, as the town itself is known for its extensive pebble beach and coastal environment. The region features significant natural wetlands like the Hâble d'Ault, a former lagoon now a vast marshland and bird sanctuary. Additionally, artificial lakes are present within holiday complexes nearby, offering recreational activities. This area provides diverse aquatic landscapes, from natural reserves rich in biodiversity to structured recreational water bodies.
Last updated: July 8, 2026
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The bay of summer, on our trip it was low tide.
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Magnificent view of the Bay of Somme at the port of Saint-Valery-sur-Somme. The largest French colony of harbor seals has taken up residence in the Bay of Somme, and you can see them here at high tide.
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Cross the Bay of the Somme from Crotoy, take the steam train back and then go to Le Hourdel to see the seals, that's all you need for a wonderful holiday. https://youtu.be/nenNw-_0ADE
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It's great to see how the landscape keeps changing due to the tides
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The Crotoy municipal marsh is often compared to a miniature version of the Camargue, offering a panorama rich in biodiversity. This natural space promises a total immersion experience for flora and fauna lovers. Don't forget your binoculars to better observe the various species that make their home there, such as storks, swans, ponies and Highland cows. It is also possible to hear or see the green tree frog, an amphibian characteristic of this region.
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Crotoy marsh at La Bassée Crotoy marsh at La Bassée / Somme Bay nature reserve / Marquenterre ornithological park / The Marquenterre dune massif, the mollières de l'Authie and the bordering enclosures / The Crotoy marsh and the adjacent foreshore, Le Crotoy
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While Cayeux-sur-Mer is known for its coastal environment, the surrounding region offers diverse water bodies. You can explore significant natural wetlands like the Hâble d'Ault, a vast marshland and bird sanctuary, or visit artificial lakes within holiday complexes such as Village Belle Dune for recreational activities.
The Hâble d'Ault is an exceptional natural site renowned as a free bird sanctuary, home to over 270 species of migratory and nesting birds. It's a paradise for ornithologists. Additionally, the Bird Sanctuary in Parc naturel régional Baie de Somme Picardie Maritime offers a family-friendly viewpoint where you can observe swans, ducks, and coots breeding right next to the cycle path.
Yes, for family-oriented activities, the artificial lakes within Village Belle Dune in Fort-Mahon-Plage offer various water-based activities like pedalo and dinghy rentals. The village also features heated swimming pools, water slides, a mini-farm, and children's clubs. For nature observation, the Bird Sanctuary in Parc naturel régional Baie de Somme Picardie Maritime and On the Seagull Route (Crotoy municipal marsh) are excellent family-friendly options to spot wildlife.
The region is rich in wildlife. At the Hâble d'Ault, you can observe over 270 bird species, including the Elegant Avocet and Belon Shelduck, along with diverse flora and fauna. The Bay of the Somme is home to the largest French colony of harbor seals, visible at high tide. The Crotoy municipal marsh, part of On the Seagull Route, boasts storks, swans, ponies, Highland cows, and even the green tree frog.
Absolutely. The Hâble d'Ault features a dedicated hiking trail that allows visitors to explore its unique marshland landscape. For more structured routes, you can find various hiking trails in the wider area. For example, the 'Observatory 4 – Hable d'Ault Observatory loop from Cayeux-sur-Mer' is an easy 7.7 km hike. You can find more hiking options in the Hiking around Cayeux-Sur-Mer guide.
The best time to visit largely depends on your interests. For birdwatching at the Hâble d'Ault, spring and autumn are ideal for observing migratory species. The seals in the Bay of the Somme are best seen at high tide, which varies daily. Generally, the warmer months offer pleasant conditions for outdoor activities, but the natural beauty can be appreciated year-round.
Yes, cycling is a popular way to explore the region. The Bird Sanctuary in Parc naturel régional Baie de Somme Picardie Maritime has a cycle path where you can observe birds. There are numerous cycling routes that pass by or near these natural areas. Check out the Cycling around Cayeux-Sur-Mer guide for routes like the 'Saint-Valery-Sur-Somme via the pointe de Houdel' loop.
The Bay of the Somme, an estuary where the Somme river meets the Channel, is a significant natural reserve. It features extensive mud flats and salt marshes, rich in marine life and water birds. The landscape constantly changes with the tides, offering dynamic views. It's also home to the largest French colony of harbor seals, making it a unique natural spectacle near the coastal areas.
Yes, the Hâble d'Ault has a rich historical dimension. It was once a lagoon and a medieval port before transforming into the marshland it is today. This past adds an interesting layer to its natural beauty and ecological significance.
Visitors frequently highlight the ever-changing landscape due to the tides, especially at the Bay of the Somme. The opportunity to observe diverse wildlife, particularly the seals and numerous bird species, is a major draw. The peaceful atmosphere of places like the Hâble d'Ault and the rich biodiversity of areas like the Crotoy municipal marsh (On the Seagull Route) are also highly appreciated.
You can find more detailed information about the Hâble d'Ault, its ornithological reserve, and guided tours on the official tourism websites. For instance, visit tourisme-baiedesomme.fr or somme-tourisme.com.


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