Best natural monuments around Saint-Martin-Boulogne offer diverse landscapes and experiences for nature enthusiasts. The area, part of the Opal Coast, features unique coastal ecosystems, dunes, and significant natural promontories. These sites provide opportunities for hiking and exploring the outdoors, showcasing the region's geological and natural heritage.
Last updated: July 3, 2026
Highlight (Segment) • Natural Monument
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Highlight • Lake
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Highlight • Viewpoint
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Very beautiful viewpoint, well worth seeing.
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Dogs are not allowed in the Lake of Mirrors.
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Beautiful lake, very peaceful. A landscaped path, you can walk there easily.
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Incredibly beautiful paths - partly on wooden planks, partly through fine sand. A small, hidden natural paradise that can be wonderfully explored on a circular hike.
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Dunes de la Slack is a beautiful nature reserve on the Opal Coast, between Wimereux and Ambleteuse. The area is named after La Slack, a river that flows through the dunes and flows into the sea at Fort d'Ambleteuse. The area is ideal for hikers and nature lovers. There are several walking routes available, including the 'La Baie de Saint-Jean' walk, which partly coincides with the GR120 du Littoral. The dunes are a varied dune area of the Parc naturel régional des Caps et marais d'Opale.
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Family-friendly walk through a vulnerable dune area near the Slack river. Not suitable for wheelchairs. The route is well marked. The dunes themselves are not accessible due to their fragile nature, so you are obliged to follow the provided paths. The stretch of beach between Ambleteuse and Wimereux is impressive.
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Nice place to walk around
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The region offers a variety of natural monuments. Highly recommended are the Dunes of the Slack, a beautiful nature reserve ideal for hiking, and the Condette Marsh Nature Reserve, known for its protected lakes and diverse wildlife. Another popular spot is the Panorama of the beach from Boulogne-sur-Mer to Pointe de la Crèche, offering stunning coastal views.
You'll encounter diverse landscapes, from extensive dune systems like the Dunes de la Slack and Dunes d'Écault, to dramatic coastal cliffs at Pointe de la Crèche, Cap Gris-Nez, and Cap Blanc-Nez. There are also serene protected wetlands and lakes, such as the Condette Marsh Nature Reserve, and secluded coves like La Crevasse Cove.
Yes, several natural monuments are suitable for families. The Dunes of the Slack offer varied paths, some on wooden planks, making them accessible for walks. The Condette Marsh Nature Reserve has excellent trails for walking and observing nature. The Panorama of the beach from Boulogne-sur-Mer to Pointe de la Crèche also provides easy access to beautiful views.
The area is excellent for various outdoor activities. You can enjoy hiking and walking through the dunes and along the coast. For more structured activities, there are numerous running trails, road cycling routes, and mountain biking trails that explore the diverse landscapes around Saint-Martin-Boulogne.
Absolutely. The Dunes of the Slack offer several walking routes, including the 'La Baie de Saint-Jean' walk, which partially coincides with the GR120 du Littoral. The Dunes d'Écault also feature extensive walking trails with stunning views. For a unique experience, explore the paths around the Condette Marsh Nature Reserve.
The Opal Coast, where these monuments are located, is beautiful year-round. Spring and autumn offer pleasant temperatures for hiking and fewer crowds. Summer is ideal for enjoying the beaches and longer daylight hours, though it can be busier. Winter provides a dramatic, rugged beauty, perfect for bracing coastal walks.
Many natural areas along the Opal Coast are dog-friendly, especially for walks on trails and beaches. However, specific rules can vary by site, particularly in protected nature reserves like the Dunes of the Slack or Condette Marsh, where dogs may need to be on a leash to protect wildlife. Always check local signage upon arrival.
For breathtaking coastal panoramas, visit the Panorama of the beach from Boulogne-sur-Mer to Pointe de la Crèche. This protected area offers expansive views extending towards Cap Gris-Nez. The Viewing Platform in the Dunes of Parc Naturel Régional des Caps et Marais d'Opale also provides excellent vistas of the canal, dunes, and Ambleteuse.
Yes, for a more secluded experience, consider La Crevasse Cove, found on the path to Cap d'Alprech. It's an unspoilt area nestled at the foot of cliffs, accessible at low tide, and popular with locals and fishermen. It offers superb views of the cliffs and the North Sea.
The natural monuments are rich in biodiversity. At the Condette Marsh Nature Reserve, you can observe varied fauna and flora, especially around the lakes. La Pointe aux Oies Beach is a paradise for migratory birds. The dune systems, like the Dunes d'Écault and Dunes of the Slack, also host unique ecosystems with specialized plant and animal life.
Located a short drive from Saint-Martin-Boulogne, Cap Gris-Nez and Cap Blanc-Nez are classified as 'Grand sites de France.' They are the closest points in France to England and offer spectacular scenery with dramatic cliffs. Their geological makeup, part of the chalk landscape of the Geopark Transmanche, dates back millions of years, making them significant for both natural beauty and geological interest.
La Pointe aux Oies Beach is a magnificent spot for photographers, known for its stunning scenery, migratory birds, and interesting rock formations. The dramatic cliffs and expansive views from Cap Gris-Nez and Cap Blanc-Nez also provide excellent photographic opportunities, especially at sunrise or sunset.


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