Natural monuments around Arrest encompass a diverse coastal and wetland landscape. This region features significant natural areas, including capes, bays, and marshlands, offering varied ecological and geological characteristics. The area is defined by its proximity to the Bay of Somme, with features shaped by marine and riverine processes. These natural formations provide habitats for diverse wildlife and present opportunities for outdoor exploration.
Last updated: June 21, 2026
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The bay of summer, on our trip it was low tide.
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you will see lots of seals
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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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Be careful, the area fills up quickly at high tide.
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At the entrance to the village, there is a splendid view over the Somme estuary and the small port of Hourdel.
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The region around Arrest offers several remarkable natural monuments. Highly recommended are Cape Hornu, known for its panoramic views of the Bay of Somme, and the expansive Baie de Somme itself, a significant nature reserve. Another notable spot is Marais du Crotoy to La Bassée, a marshland area within the Somme Bay nature reserve.
The natural monuments around Arrest are characterized by a diverse coastal and wetland landscape. You'll find prominent capes like Cape Hornu, extensive bays such as the Baie de Somme, and rich marshlands like Marais du Crotoy to La Bassée. These areas are shaped by marine and riverine processes, offering varied ecological and geological characteristics.
Visitors particularly appreciate the panoramic views, especially from locations like Cape Hornu, and the rich wildlife found in the Bay of Somme. The historical significance of areas like Saint-Valery-sur-Somme, near Cap Hornu, also adds to the experience. The diverse landscapes, from beaches to marshlands, provide ample opportunities for exploration and enjoying nature.
Yes, there are numerous hiking opportunities. For instance, you can find trails that offer views of the Bay of Somme or lead to the Port of Saint-Valery-sur-Somme. You can explore various routes, including easy and moderate options, to fully experience the natural beauty of the region. For detailed routes, refer to the Hiking around Arrest guide.
Beyond hiking, the area around Arrest is suitable for various outdoor activities. You can enjoy running on trails such as the 'Running loop from Arrest' or 'Guillaume Towers – Cape Hornu loop from Estrébœuf'. Gravel biking is also popular, with routes like the 'Saint-Valery-sur-Somme – Le Crotoy loop'. For more information on these activities, check the Running Trails around Arrest and Gravel biking around Arrest guides.
Many natural monuments in the region are suitable for families. Cape Hornu, the Baie de Somme, and Marais du Crotoy to La Bassée are all categorized as family-friendly. Additionally, the Pond of the Baie de Somme Picardie Maritime Regional Nature Park offers a pleasant spot with ducks and swans, ideal for a family picnic.
The natural monuments around Arrest, particularly the coastal and wetland areas, can be enjoyed year-round. However, spring and autumn are often ideal for birdwatching in the Bay of Somme. Summer offers pleasant weather for coastal walks and exploring the beaches. Winter can provide a unique, tranquil experience, though some facilities might have reduced hours.
Absolutely. The Baie de Somme is a renowned nature reserve rich in diverse life forms, including marine animals, numerous water birds, and seals. The marshlands like Marais du Crotoy to La Bassée, part of the Marquenterre ornithological park, are particularly excellent for birdwatching.
Yes, the history of the region is deeply intertwined with its natural landscape. For example, Cape Hornu is near Saint-Valery-sur-Somme, a medieval town with significant historical events, including William the Conqueror's departure for England and Joan of Arc's imprisonment. The area also has ancient religious sites like the Chapelle des Marins.
While the main highlights are well-known, exploring the broader areas of the Baie de Somme and its various marshlands can reveal quieter spots. The The Hâble d'Ault Route, for instance, offers a unique landscape of lowlands isolated by pebbles, home to specific pioneer habitats and diverse birdlife, providing a different perspective away from the more frequented areas.
Yes, some locations offer amenities for visitors. The Pond of the Baie de Somme Picardie Maritime Regional Nature Park is specifically mentioned as a place where you can have a picnic. Additionally, towns like Saint-Valery-sur-Somme, which is close to Cape Hornu, will have cafes and restaurants.


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