4.4
(1427)
7,933
hikers
332
hikes
Hiking around Houlle offers exploration within the Audomarois marshes, a UNESCO Biosphere Reserve in Pas-de-Calais, France. This region is characterized by a unique blend of land and water, featuring an extensive network of canals, ponds, and the meandering River Houlle. The landscape, shaped by historical human activity and natural processes, supports diverse flora and fauna, providing a distinct environment for outdoor activities.
Last updated: October 27, 2026
4.6
(37)
288
hikers
6.35km
01:36
10m
10m
Easy hike. Easily walkable paths.
4.6
(7)
34
hikers
7.22km
01:58
110m
110m
Easy hike. Easily walkable paths.

4.6
(10)
36
hikers
11.5km
02:55
30m
30m
Moderate hike. Good fitness required. Easily walkable paths.
4.2
(5)
39
hikers
6.63km
01:46
70m
70m
Easy hike. Easily walkable paths.
4.6
(10)
34
hikers
9.40km
02:24
30m
30m
Moderate hike. Good fitness required. Easily walkable paths.
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Signposted walking route in the forest
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Situated along the River Houlle, the Serques Marshes are part of the larger Audomarois Marshes. This area is renowned for its rich biodiversity and beautiful scenery. The nearby village of Houlle is a popular destination for tourists looking for a peaceful waterside holiday. The River Houlle, a tributary of the Aa, flows through these marshes and provides a picturesque setting for walks and boat trips. The area is also known for the production of Houlle gin, a traditional spirit. The marshes themselves are an important natural area and are home to a variety of plant and animal species. It is an ideal place for nature lovers and bird watchers.
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This 22m high bunker protrudes like a mountain of concrete above the fôret d'Eperlecques. It was built as a launching pad to bombard London with V2 rockets. The 5m thick concrete capstone was gradually lifted with a jack system as construction progressed. He had to protect the workers from the bombardments. But on August 27, 1943, 185 "flying fortresses" launched in England dropped several tons of bombs on the bunker. Numerous deportees who were employed there died in the bombardment. The bunker was then enlarged to house a liquid oxygen plant.
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Nice road but asphalt completely rotten.
2
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Very soothing place but actually forbidden to bike.
3
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Hiking around Houlle offers a unique immersion into the Audomarois marshes, a UNESCO Biosphere Reserve. The landscape is characterized by an extensive network of waterways, canals, and wetlands, providing a distinct blend of land and water. You'll find diverse flora and fauna, traditional waterside scenery, and a peaceful environment for exploration.
There are over 300 hiking routes available around Houlle. The area caters to various skill levels, with more than 130 easy routes and over 150 moderate trails. Only a small number, around 12, are considered difficult.
Yes, Houlle offers over 130 easy routes, perfect for beginners or family-friendly outings. These trails allow you to enjoy the unique marshland scenery without strenuous effort. For example, the The Éperlecques Blockhaus – Foret d' Eperlecques loop from Watten is an easy 6.6 km trail that takes about 2 hours to complete.
The primary attraction is the vast Audomarois marshes themselves, with their labyrinthine waterways and rich biodiversity. You might spot swans or grey herons. A significant natural highlight is the Romelaëre Ponds Nature Reserve, known for its ponds, canals, and diverse wildlife, including various bird species. The Romelaëre Nature Reserve Circuit is a great way to explore this area.
The routes in Houlle are highly rated by the komoot community, with an average score of 4.5 stars from over 1000 reviews. More than 6000 hikers have used komoot to explore Houlle's varied terrain, often praising the unique marshland environment and the peacefulness of the trails.
Many of the trails around Houlle are designed as loops, allowing you to start and end at the same point. An example is the Chain tray – Lansberghe Path loop from Serques, a moderate 9.8 km trail that offers views of the marshland and traditional waterside scenery.
While specific regulations for dogs vary by trail and protected area, generally, dogs are welcome on many public footpaths in the Audomarois marshes, provided they are kept on a leash to protect local wildlife and respect other hikers. It's always best to check local signage for any specific restrictions.
The Audomarois marshes offer beauty year-round. Spring brings blooming flora and active birdlife, while summer provides pleasant weather for longer explorations. Autumn showcases beautiful colors, and even winter can be serene, with a different kind of quiet beauty. However, some paths might be muddier after heavy rain, so appropriate footwear is always recommended.
Yes, the region has a rich history. The village of Houlle itself features a historic church with a 12th-century Romanesque tower and the 6th-century Saint-Bertin well. Nearby, you can also find the Saint-Omer Cathedral and the Watten Hill, which offers panoramic views of the surrounding area.
The Audomarois marshes are a haven for biodiversity. You might encounter over 200 species of birds, including swans and grey herons, as well as various fish species and nearly 400 varieties of plants. The unique wetland environment supports a rich ecosystem, making it an excellent spot for nature observation.
While the majority of routes are easy to moderate, there are a few more challenging options for experienced hikers. For example, the Monument aux mort – Saint-Omer Marshes loop from Watten is a moderate 11.8 km path that explores the wider Saint-Omer Marshes, offering a longer and more immersive experience.


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