Best natural monuments around Mons-Boubert are found within the tranquil setting of the Bay of Somme, a "Grand Site de France" known for its outstanding natural beauty and diverse ecosystems. This region, encompassing nearly 7,200 hectares, features a dynamic landscape of dunes, cliffs, pebble beaches, and marshes. It is recognized for its rich biodiversity and unique coastal ecosystems, offering various opportunities for nature exploration. The area provides a preserved natural environment for nature lovers and outdoor enthusiasts.
Last updated: May 7, 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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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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From here you can see the sea and a castle or a manor in the foreground. However, the path to the viewpoint is unpaved and only suitable for bikes with reasonably wide tires.
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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 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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Visitors frequently enjoy exploring Cape Hornu, which offers panoramic views of the Bay of Somme and its wildlife. Another highly appreciated spot is the View of the Somme Estuary and the port of Le Hourdel, known for excellent seal sightings. These locations are celebrated for their natural beauty and are well-loved by the komoot community.
The region around Mons-Boubert, nestled within the Bay of Somme, is characterized by a dynamic landscape. You'll find expansive estuaries, golden dunes, imposing cliffs, and pebble beaches. The area also features lush green prairies and extensive marshes, all continually shaped by the tides. The unique ecosystem supports diverse flora like sea asters, samphire, and sea purslane.
Yes, the Bay of Somme is a prime location for wildlife. The Baie de Somme itself is rich in marine animals, water birds, and seals. Specifically, the View of the Somme Estuary and the port of Le Hourdel is renowned for seal sightings. Further afield, the Parc du Marquenterre is a world-class ornithological park, a crucial haven for migratory birds.
The area holds significant historical depth. For instance, Cape Hornu, near Saint-Valery-sur-Somme, has a history dating back to before the Roman invasion. It was once a strategic port from which William the Conqueror departed to invade England in 1066. The cape itself is named from the Picard word “hornu,” meaning “horned” or “pointed,” referring to its shape.
Absolutely. Many of the natural monuments in the area are suitable for families. Cape Hornu, the Baie de Somme, and the View of the Somme Estuary and the port of Le Hourdel are all categorized as family-friendly, offering accessible views and opportunities for children to experience nature.
The region offers a variety of outdoor activities. You can find numerous hiking trails, such as the 'Port of Saint-Valery‑sur‑Somme – Saint-Valery-sur-Somme loop' (easy, 7.2 km) or the 'Miannay Manor loop' (moderate, 7.7 km). For cyclists, there are MTB trails like the 'Somme Bay – Saint-Valery-sur-Somme loop' (moderate, 50.6 km) and gravel biking routes. You can explore more options on the Hiking around Mons-Boubert or MTB Trails around Mons-Boubert guide pages.
The Bay of Somme is beautiful year-round, but the best time often depends on your interests. Spring and autumn are ideal for birdwatching, especially at locations like Parc du Marquenterre, due to migratory patterns. Summer offers pleasant weather for coastal walks and enjoying the beaches. For seal spotting, low tide is generally the best time, which can occur at any season.
Yes, several spots provide stunning vistas. Cape Hornu offers panoramic views of the entire Bay of Somme. Another excellent location is the View of the Somme Estuary and the port of Le Hourdel, which provides splendid views over the estuary. Additionally, the View of the Sea and Manor Between Woignarue and Brutelles offers a unique perspective of the coastline and a historic manor.
While specific dog rules for each natural monument may vary, many coastal paths and natural areas in the Bay of Somme are generally dog-friendly, especially if dogs are kept on a leash. It's always recommended to check local signage or specific park regulations before visiting, particularly in sensitive wildlife areas like nature reserves.
The villages and towns surrounding the Bay of Somme, such as Saint-Valery-sur-Somme and Le Hourdel, offer various amenities. You can find cafes, pubs, and accommodation options in these areas. For example, Saint-Valery-sur-Somme, near Cape Hornu, is a charming town with medieval streets and colorful houses, providing services for visitors.
Yes, guided tours are highly recommended for certain natural experiences, particularly for observing seals at locations like Pointe du Hourdel, to ensure responsible viewing. Guided walks across the Bay of Somme estuary are also available and strongly advised due to shifting sands and tidal conditions, offering an extraordinary opportunity to experience this natural wonder up close.


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