Best natural monuments around Noyelles-Sur-Mer are found at the gateway to the Baie de Somme, an ecologically rich estuary. This area features a dynamic landscape of vast tidal flats, sprawling marshes, dunes, and salt meadows. It serves as a critical stopover for over 300 species of migratory birds and hosts France's largest colony of harbor seals. The region offers diverse natural attractions for exploration.
Last updated: July 5, 2026
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The bay of summer, on our trip it was low 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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The dike at Favières is a hiking trail that takes you to the edge of the Bay of Somme, a nature reserve that is home to a rich biodiversity of fauna and flora. It was built in the 19th century to protect the land from the sea. The sea wall offers a panoramic view of the bay, where you can observe the changing colors of the water, the sandbanks and the marshes. You will also be able to spot many birds, such as herons, egrets, ducks and geese.
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At Cape Hornu you can enjoy a panoramic view of the bay and its wildlife. You can follow the path along the coast, passing by the Chapelle des Marins, a small chapel dedicated to sailors who lost their lives at sea. You will also discover the charming town of Saint-Valery-sur-Somme, with this medieval street plan, its ancient ramparts and its colorful houses. It's a great way to experience the beauty and history of this area.
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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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Cap Hornu is a cape located near Saint-Valery-sur-Somme, on the south bank of the Bay of Somme. The name Cap Hornu comes from the Picard word “hornu”, which means “horned” or “pointed”, and refers to the shape of the cape. The cape was also known as Cap Saint-Valery in the past. The history of Cap Hornu is closely linked to that of Saint-Valery-sur-Somme, which was a strategic port and a medieval town that witnessed many historical events. In 1066, William the Conqueror departed from Saint-Valery-sur-Somme with his fleet to invade England. In 1431, Joan of Arc was imprisoned in Saint-Valery-sur-Somme before being transferred to Rouen. In 1568, a massacre of Huguenots took place in Saint-Valery-sur-Somme after a battle between Catholics and Protestants
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Numerous waterfowl, such as swans, ducks and coots can be observed on the natural ponds of the park.
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The Bay of the Somme or Somme Bay (French: Baie de Somme) is a nature reserve in the Somme department in northern France. This bay has an area of 70 km² and extends from Le Hourdel to Saint-Quentin-en-Tourmont. The bay is formed by the estuary of the Somme, which flows into the Channel here. A smaller river, the Maye, also flows into the bay here. The bay consists of mud flats and salt marshes, and the fresh water is carried north by the Fleuve marin côtier, a coastal current along the Picardy estuaries. The bay is rich in life forms, both marine animals, water birds, seals and the like. Sea lavender, sea wort and samphire are some of the characteristic plants on the salt marshes. The bay is also important from a cultural history point of view. For example, William the Conqueror set out from Saint-Valery-sur-Somme to conquer England. https://nl.wikipedia.org/wiki/Baai_van_de_Somme
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The area around Noyelles-sur-Mer is dominated by the expansive Baie de Somme, an estuary characterized by its dynamic landscape of vast tidal flats, sprawling marshes, dunes, and salt meadows. This rich environment is a critical stopover for over 300 species of migratory birds and hosts France's largest colony of harbor seals.
For exceptional birdwatching, visit the Parc Ornithologique du Marquenterre, located within the northern part of the Baie de Somme. It's a world-class bird sanctuary with well-maintained trails and observation hides. You can also get a Panoramic view of Marquenterre Park from a dedicated viewpoint. To see seals, the Pointe du Hourdel in the southern part of the bay is a prime location, especially at low tide.
Yes, several natural monuments are family-friendly. The Baie de Somme itself offers accessible areas for gentle exploration. The Parc Ornithologique du Marquenterre is also excellent for families, providing educational activities and easy trails for observing birds. The Pointe du Hourdel is a great spot to see seals, which is often a highlight for children.
The Baie de Somme Regional Nature Park, which includes Noyelles-sur-Mer, offers an extensive network of hiking and cycling paths. These routes traverse diverse landscapes like marshlands, coastal dunes, and the estuarine environment. You can find various options, including cycling routes and running trails, to explore the region's natural beauty at your own pace.
The Baie de Somme is dynamic year-round. Spring and autumn are ideal for birdwatching due to migratory patterns. Summer offers pleasant weather for coastal walks and cycling. Winter provides a unique, tranquil experience with different bird species. Always check local tide times, especially if planning to explore tidal flats.
Yes, Cape Hornu, a cape near Saint-Valery-sur-Somme, offers panoramic views of the bay and its wildlife, but also has significant historical ties. Its history is linked to Saint-Valery-sur-Somme, a strategic medieval port from which William the Conqueror departed in 1066 to invade England.
Beyond the main estuary, you can explore the Crotoy Municipal Marsh, often described as a miniature Camargue due to its rich biodiversity. It's home to diverse flora and fauna, including storks, swans, ponies, Highland cows, and green tree frogs. Another unique area is The Hâble d'Ault Route, a lowland isolated from the sea by a bead of pebbles, hosting rare pioneer habitats and adapted plants like sea cabbage.
The natural monuments offer diverse and breathtaking views. From Cape Hornu, you get panoramic views of the bay. The Panoramic view of Marquenterre Park provides a 360-degree vista of the bird sanctuary and the Bay of Somme. The Marquenterre Park Observatory offers expansive views of the sea, dunes, and birds.
The duration of your visit depends on your interests. A quick stop at a viewpoint like Cape Hornu might take an hour. Exploring the Parc Ornithologique du Marquenterre or undertaking a guided walk across the Baie de Somme could easily fill half a day or more. For a comprehensive experience, plan a full day or even several days to explore different sites and activities like cycling or seal watching.
Yes, the region offers several road cycling routes that allow you to explore the natural monuments. For example, you can find routes like the 'Strada biancha Picarda – Dune Trail loop' or the 'Hourdel Lighthouse – Hourdel Beach and Hourdel Point loop'. These routes provide excellent opportunities to discover the area's natural beauty by bike. More details can be found in the Road Cycling Routes around Noyelles-Sur-Mer guide.
While many natural areas involve uneven terrain, some parts of the Baie de Somme and its attractions offer more accessible options. The Parc Ornithologique du Marquenterre, for instance, has well-maintained trails. It's advisable to check specific site information for details on wheelchair accessibility or stroller-friendly paths before your visit.
Visitors frequently praise the exceptional natural beauty, the diverse wildlife observation opportunities (especially birds and seals), and the tranquility of the landscapes. The panoramic views from spots like Panoramic view of Marquenterre Park and the unique experience of the dynamic tidal flats are often highlighted as memorable aspects.


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