Best natural monuments around Longuenesse are primarily found within the unique wetland landscape of the Audomarois marshes. This region, a natural collector of water from the Artois hills, features winding canals, cultivated plots, and open fields separated by ditches. The area includes significant natural attractions such as the Romelaëre Ponds Nature Reserve, a remnant of 19th-century peat cutting. These natural features provide diverse habitats for flora and fauna, offering various outdoor exploration opportunities.
Last updated: July 2, 2026
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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
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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.
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Magnificent lake in the middle of the forest, ideal for starting a walk around the lake or a hike through the forest
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Nice descent a bit technical For novices but possible at low speed
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The most unique natural monument is the Romelaëre Nature Reserve Circuit, a significant wetland area that is a remnant of 19th-century peat cutting. It features a rich diversity of flora and fauna across its ponds, canals, and chain pits. Another distinct site is the Bomb Crater in Parc Naturel Régional des Caps et Marais d'Opale, which offers a varied forest tour and serves as a relic of the Second World War.
Yes, several natural monuments are suitable for families. The Romelaëre Nature Reserve Circuit is very family-friendly, with a nearly 2 km developed route that is also accessible for individuals with reduced mobility. Harchelle Lake, nestled in the forest, is another great spot for a family walk. Additionally, the Saint-Omer Public Garden offers a mix of landscape styles, an arboretum, and animals, making it enjoyable for all ages.
The natural monuments, especially within the Audomarois Marshes and the Romelaëre Nature Reserve, are rich in biodiversity. You can expect to see a wide variety of bird species, making it a rewarding destination for birdwatchers. The wetland ecosystems also support diverse aquatic life and various flora unique to marshland environments.
The region offers a range of outdoor activities. You can explore the Audomarois marshes by boat, on foot, or by bike. For hiking, there are numerous trails, including easy walks around Harchelle Lake or more varied tours in the forest near the Bomb Crater. You can find more hiking options in the Hiking around Longuenesse guide. For cycling, there are MTB trails and gravel biking routes available, such as those listed in the MTB Trails around Longuenesse guide and the Gravel biking around Longuenesse guide.
Yes, the Romelaëre Ponds Nature Reserve is dedicated to biodiversity conservation and welcomes the public, including individuals with reduced mobility. It features a nearly 2 km developed route designed for accessibility.
While the Audomarois Marshes generally offer paths for exploration, specific regulations apply to nature reserves. For instance, the Romelaëre Ponds Nature Reserve typically has restrictions on dogs to protect its delicate ecosystem and wildlife. It's advisable to check local signage or contact the reserve directly for their current dog policy before your visit.
The Audomarois Marshes offer a unique experience best explored by boat, on foot, or by bike. You can enjoy serene waterways by taking a traditional Bacôve boat trip, often available from the Maison du Marais visitor center in Saint-Omer. Numerous paths also wind through the landscape, perfect for walking or cycling.
Yes, the region combines natural beauty with historical significance. The Bomb Crater in Parc Naturel Régional des Caps et Marais d'Opale is a notable historical site, serving as a relic from the Second World War within a forest setting. Additionally, the Saint-Omer Public Garden was created on the site of old city fortifications from 1893, offering a blend of natural beauty and historical context.
The natural monuments around Longuenesse, particularly the Audomarois Marshes and the Romelaëre Ponds Nature Reserve, are beautiful throughout the year. Spring and summer offer lush greenery and active wildlife, ideal for boat trips and walks. Autumn brings vibrant colors to the landscape, while winter can provide a peaceful, serene atmosphere, though some paths might be muddy.
Within the Audomarois Marshes, specifically in the village of Houlle, you can find the Persyn distillery, which is the oldest grain distillery in France. They produce the renowned Houlle juniper (genièvre de Houlle). Visits can be arranged by reservation. More information can be found on the local tourism site: tourisme-saintomer.com.
Yes, there are several easy walking trails. The Romelaëre Nature Reserve Circuit offers a well-maintained, nearly 2 km route. The trails around Harchelle Lake are also ideal for leisurely walks. For more options, the Hiking around Longuenesse guide lists several easy routes, such as the 'Saint-Omer Public Garden – The theater loop from Longuenesse'.
When visiting, especially the wetland areas like the Audomarois Marshes, it's advisable to wear appropriate footwear, as some paths can be muddy. Bringing binoculars for birdwatching in the Romelaëre Nature Reserve is recommended. Always carry water and snacks, and check the weather forecast before heading out. For boat trips in the marshes, consider booking in advance, especially during peak season.


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