Best natural monuments around Saint-Valery-Sur-Somme include diverse landscapes shaped by the Somme estuary and the English Channel. The region, part of the Baie de Somme, is a protected natural site known for its rich biodiversity. It features extensive mudflats, salt marshes, and sandbanks, providing habitats for various wildlife. The area is recognized for its significant seal colony and as a crucial stopover for migratory birds.
Last updated: October 7, 2026
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Journey from Flanders to the Somme – GR 120 coastal path
Cycling around Saint-Valery-Sur-Somme
Hiking around Saint-Valery-Sur-Somme
Running Trails around Saint-Valery-Sur-Somme
Road Cycling Routes around Saint-Valery-Sur-Somme
MTB Trails around Saint-Valery-Sur-Somme

Gravel biking around Saint-Valery-Sur-Somme
The bay of summer, on our trip it was low tide.
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Gaston Caudron (actually Alphonse) (Favières, 18 January 1882 - 10 December 1915) and René Caudron (Favières, 1 July 1884 - 27 September 1959) were French aviation pioneers. They founded the world's first flying school and built the world's first seaplane. The Caudron brothers were farmers with a passion for aviation, which was then gaining popularity. In the spring of 1908, they built a glider with which they made their first flights on the fields of a farm (Ferme de Romiotte) a few kilometres from Le Crotoy. The aircraft was pulled by a horse. In this way, they realised six flights over a distance of between 800 and 1200 m. René piloted the glider. In 1909, they founded the company Aéroplanes Caudron Frères and from 1910 the Société des avions Caudron, initially established in Le Crotoy and later in Rue. They acquired a special place in the history of aviation. In 1910, they founded the first flying school in the world, attracting future pilots, and in August 1910, René obtained his pilot's license in Le Touquet. In March 1911, Gaston obtained his civil aviation license. In 1912, the brothers built the first seaplane in the world.
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Le Port du Crotoy is a charming stop on your mountain bike ride, with its picturesque harbour full of colourful fishing boats and traditional sailing ships. As you walk along the harbour, you can enjoy the lively atmosphere and views of the Baie de Somme. It’s the perfect place to take a break, soak up the maritime charm and perhaps grab a bite to eat at one of the waterfront cafés.
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If you're lucky, you'll see sea lilacs, a plant with purple flowers that covers the beach in summer. It is a rare and magnificent spectacle that will make your hike unforgettable.
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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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Visitors frequently enjoy Cape Hornu, which offers panoramic views of the bay and its wildlife. The expansive Baie de Somme itself is a major draw, known for its mudflats, salt marshes, and diverse wildlife. Another popular spot is the Panoramic view of Marquenterre Park, providing a 360-degree perspective of the Parc du Marquenterre and the bay, ideal for birdwatching.
The Baie de Somme is a haven for wildlife. You can observe a significant colony of seals, primarily harbor seals and grey seals, especially at Cape Hornu and the wider Baie de Somme. The region is also a crucial stopover for thousands of migratory birds, with over 300 species observed, making it an excellent birdwatching destination, particularly at the Panoramic view of Marquenterre Park and the Marquenterre Park Observatory.
The Pointe du Hourdel, located at the southern tip of the Baie de Somme, is renowned as one of the best places in France to observe seals. You can often spot them resting on sandbanks during low tide from the seawall or a dedicated viewpoint. It's recommended to visit about 90 minutes before low tide and bring binoculars, maintaining a distance of at least 300 meters to avoid disturbance.
Yes, many natural monuments are suitable for families. Cape Hornu and Baie de Somme are both listed as family-friendly. The Panoramic view of Marquenterre Park and the Marquenterre Park Observatory are also great for families interested in birdwatching. The Maison de la Baie de Somme offers an immersive experience to learn about the bay's environment, which can be engaging for children.
The area offers a variety of outdoor activities. You can enjoy cycling on routes like the "Port of Saint-Valery-sur-Somme – Cap Hourdel Lighthouse loop" or the "Kanal der Somme – Cycle path along the Canal Somme loop." For running, popular trails include the "View of the Somme ⛵ – Somme Bay 🔭 loop" and "Saint-Valery-sur-Somme – Cape Hornu loop." Mountain biking is also an option with routes such as the "Somme Bay – Le Hourdel Marina loop." You can find more details on these activities in the cycling guide, running guide, and MTB guide for Saint-Valery-sur-Somme.
Yes, several natural sites have historical significance. Cape Hornu is historically linked to the early settlement of Saint-Valery-sur-Somme and its medieval past, including connections to William the Conqueror and Joan of Arc. The Herbarium des Remparts in Saint-Valery-sur-Somme, while a cultivated space, offers insight into the flora of the old city walls and a contemporary interpretation of medieval gardens.
The Baie de Somme is beautiful year-round, but the best time depends on your interests. For seal observation, low tide is crucial, and they are generally present throughout the year. For birdwatching, spring and autumn are particularly rewarding due to migratory periods. Summer offers pleasant weather for walking and cycling, while winter can provide a stark, beautiful landscape.
Yes, the Maison de la Baie de Somme, located between Saint-Valery-sur-Somme and Le Hourdel, serves as an interpretation center. It provides an immersive experience to understand the bay's evolution, flora, fauna, and its seal colony. Nature guides from the Maison de la Baie also lead themed outings to observe seals, birds, and tidal phenomena.
Beyond the main Baie de Somme, you can explore The Hâble d'Ault Route, a unique wetland area isolated from the sea by a bead of pebbles. This site is known for its gravel pits, which are home to various waterfowl and pioneer habitats rare in continental Europe. It offers a distinct landscape shaped by the erosion of the Pays de Caux cliffs.
Given the coastal and wetland environment, it's advisable to wear layers as weather can change quickly. Comfortable, waterproof walking shoes or boots are highly recommended, especially for exploring mudflats or pebble beaches. A windproof and waterproof jacket is also useful, along with sun protection and binoculars for wildlife viewing.
While many natural areas involve walking on uneven terrain, some viewpoints and paths may offer better accessibility. For instance, the seawall at Pointe du Hourdel provides a relatively flat surface for seal observation. It's best to check specific site conditions or inquire with local tourist information for detailed accessibility information on individual natural monuments or trails.
Visitors particularly appreciate the stunning panoramic views, especially from spots like Cape Hornu and the Panoramic view of Marquenterre Park. The opportunity for wildlife observation, especially seals and migratory birds, is a major highlight. The diverse landscapes, from pebble beaches to salt marshes, and the tranquility of nature are also frequently mentioned as enjoyable aspects.


Extend your search for the best caves by checking out these guides of the top ones around Saint-Valery-Sur-Somme: