Best lakes around Arrest are found within a region characterized by significant natural reserves and coastal landscapes. This area, primarily encompassing the Baie de Somme, features extensive mud flats, salt marshes, and estuaries where the Somme River meets the Channel. It is recognized for its rich biodiversity, including various bird species, seals, and unique flora. The changing tides create a dynamic environment, offering diverse natural experiences for visitors.
Last updated: August 31, 2026
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Very beautiful to see the bay from this viewpoint at sunrise.
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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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Super easy, very reasonable distance. Maritime landscape that changes constantly. Different every day thanks to the play of the tides!
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The region around Arrest is characterized by significant natural reserves and coastal landscapes, primarily encompassing the Baie de Somme. You'll find extensive mud flats, salt marshes, estuaries where the Somme River meets the Channel, and tranquil ponds. The dynamic environment, constantly changing with the tides, offers diverse natural experiences.
For wildlife viewing, particularly seals, visit View of the Bay of the Somme and its seals. This spot is known for being home to the largest French colony of harbor seals, which can often be observed at high tide from the port of Saint-Valery-sur-Somme.
Yes, several areas are great for families. On the Seagull Route, which includes the Crotoy municipal marsh, is a natural area rich in biodiversity with various bird species, ponies, and Highland cows. The Baie de Somme itself is also family-friendly, offering beach access and opportunities to explore marine life. Additionally, the Pond of the Baie de Somme Picardie Maritime Regional Nature Park is a nice spot with ducks and swans, perfect for a picnic.
The Crotoy municipal marsh, part of On the Seagull Route, is an excellent spot for birdwatching, often compared to a miniature Camargue due to its rich avian biodiversity. You might see storks, swans, and various waders. The wider Baie de Somme is also rich in water birds.
Absolutely! The region offers various cycling opportunities. For road cycling, you can explore routes like the 'Strada biancha Picarda – Dune Trail loop from Saint-Valery Canal' or the 'Hourdel Lighthouse – Hourdel Beach and Hourdel Point loop from Saint-Valery-sur-Somme'. Mountain biking trails are also available, such as the 'Somme Bay – Saint-Valery-sur-Somme loop from Routhiauville'. You can find more details and routes on the Road Cycling Routes around Arrest and MTB Trails around Arrest guide pages.
Yes, many areas offer easy walks. The path around View of the Bay of the Somme and its seals is described as super easy and a reasonable distance. The On the Seagull Route also offers accessible trails through the marshlands. For more specific routes, consider checking the MTB Trails around Arrest guide, which includes easy-rated routes like the 'Somme Bay – Le Hourdel Marina loop from Saint-Valery-sur-Somme'.
The region's landscape is constantly changing due to the tides, offering a unique experience at any time. For observing seals, high tide is recommended. Spring and autumn are generally pleasant for outdoor activities, with milder weather and vibrant natural displays. Winter walks can also be rewarding, offering a different perspective of the dynamic coastal environment.
While specific dog policies for each highlight are not detailed, many natural outdoor areas in France are dog-friendly, especially on trails and beaches, provided dogs are kept on a leash. It's always best to check local signage upon arrival or specific regulations for nature reserves like the Baie de Somme to ensure compliance.
While the Baie de Somme is well-known, exploring the various smaller marshlands and ponds, such as the Marais du Crotoy to La Bassée, can offer a more secluded experience. These areas provide rich biodiversity and tranquil settings away from the main tourist hubs, allowing for a deeper immersion in nature.
Given the dynamic coastal environment and potential for changing weather, it's advisable to wear layers. Waterproof or windproof outerwear is recommended, especially near the coast. Comfortable walking shoes or boots are essential for exploring trails and potentially muddy areas. Don't forget binoculars for wildlife viewing and sun protection.
The Baie de Somme is unique as a natural monument and a large estuary where the Somme River meets the Channel. Its landscape constantly changes with the tides, revealing vast mud flats and salt marshes. It's exceptionally rich in marine animals, water birds, and seals, and holds historical significance, for example, as a departure point for William the Conqueror.


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