Best natural monuments around Clairmarais are found within the Audomarois marsh, a unique wetland ecosystem and UNESCO Biosphere Reserve. This region features a network of ponds, canals, and forests, shaped by centuries of human activity and natural processes. The landscape offers a blend of diverse flora and fauna, making it a notable area for nature observation.
Last updated: June 18, 2026
Highlight (Segment) • Trail
Translated by Google •
Tip by
Highlight • Historical Site
Translated by Google •
Tip by
Sign up now to discover places like this
Get recommendations on the best single tracks, peaks, & plenty of other exciting outdoor places.
Sign up for free
Highlight • Historical Site
Translated by Google •
Tip by
Highlight • Lake
Translated by Google •
Tip by
Highlight (Segment) • Gorge
Translated by Google •
Tip by
Sign up for free to discover even more natural monuments around Clairmarais.
Sign up for free
Already have an account?
Start today with a free account
Your next adventure awaits.
Login or Signup
Nice, here you can compare the photo with the current situation. 13th century: stone sculptor; 1600: moving with the pole (flat bottom/punter) 1700: dredging with a dredging net 1850: drainage mill 1900: fishing with bundle of branches 1920: harrowing and rolling
7
0
The Réservé Naturelle Nationale des Étangs du Romelaëre is a beautiful nature reserve located in Clairmarais, Saint-Omer and Nieurlet. This reserve, which covers approximately 108 hectares, is a remnant of an old peat cutting from the 19th century. The area consists of ponds, canals, bridges and chain pits, and offers a rich diversity of flora and fauna.
7
0
Magnificent lake in the middle of the forest, ideal for starting a walk around the lake or a hike through the forest
1
0
Nice descent a bit technical For novices but possible at low speed
1
0
Clairmarais is rich in natural beauty, primarily within the Audomarois marsh. You can explore the Romelaëre Nature Reserve Circuit, which features a network of ponds, canals, and diverse flora and fauna. Another notable spot is Harchelle Lake, a serene lake nestled within the forest, perfect for tranquil walks.
The region offers a variety of trails. For instance, the Romelaëre Ponds Nature Reserve has accessible walking trails, including a 4 km 'Cormorant Trail' with paths on stilts and observatories. The Forest of Clairmarais provides both shaded, landscaped trails and wilder paths, such as those around Harchelle Lake. You can find numerous options for hiking around Clairmarais, ranging from easy to moderate.
Yes, many natural monuments in Clairmarais are family-friendly. The Romelaëre Nature Reserve Circuit is ideal, offering accessible paths and wildlife viewing opportunities. Harchelle Lake and the surrounding forest also provide pleasant and safe environments for family walks.
The Audomarois marsh and its natural monuments are beautiful year-round, but spring and autumn are particularly recommended. Spring brings vibrant flora and active wildlife, while autumn offers stunning foliage in the Forest of Clairmarais. The Romelaëre Ponds are especially rich in birdlife during migratory seasons.
Clairmarais is characterized by its unique wetland ecosystem, the Audomarois Marsh, a UNESCO Biosphere Reserve. Key features include a labyrinthine network of ponds, canals, and reed beds, as well as the expansive Forest of Clairmarais. These areas support exceptional biodiversity, including numerous bird species, amphibians, and diverse tree species.
Yes, parking is generally available near the main natural monuments. For example, the Grange Nature, a visitor center at one of the main entrances to the Romelaëre Ponds Nature Reserve, provides a convenient starting point with parking facilities.
While many outdoor areas in France are dog-friendly, it's advisable to check specific regulations for nature reserves like the Romelaëre Ponds, as they often have restrictions to protect wildlife. In general forest areas like the Forest of Clairmarais, dogs are usually permitted on leash.
Yes, the region blends natural beauty with history. The Bomb Crater in Parc Naturel Régional des Caps et Marais d'Opale offers a varied tour through the forest, including relics from the Second World War. Additionally, the Audomarois Marsh itself has a long history of human activity, with its landscape shaped by centuries of market gardening and peat cutting.
Beyond hiking and walking, the Clairmarais area offers various outdoor activities. You can enjoy cycling through the forest and marshland, or explore the waterways by boat. The region is also popular for running, with numerous trails winding through diverse landscapes.
Generally, no specific permits are required for visiting the natural monuments or hiking on public trails in Clairmarais. However, for guided tours or specific activities within protected areas like the Romelaëre Ponds Nature Reserve, it's best to check with the visitor center, such as the Grange Nature, for any specific requirements or booking information.
The Romelaëre Ponds Nature Reserve is an immense open-air aviary, home to around 230 bird species, including cormorants, crested grebes, and the starry bittern. Its waters teem with amphibians and fish. The Audomarois Marsh also supports incredible biodiversity, including a significant heron colony and rare animals like otters.
Yes, for the Romelaëre Ponds Nature Reserve, the Grange Nature serves as a visitor center. It provides exhibitions, educational materials, and guided tours, making it an excellent starting point for exploring the reserve's natural riches.


Extend your search for the best caves by checking out these guides of the top ones around Clairmarais: