267
runners
Tour of the Semois Valley
05:59
44.9km
1,620m
Running
Jog the difficult L'Alletante 45K in Semois Valley National Park, a 27.9-mile route with 5306 feet of elevation gain.
Last updated: February 26, 2026
Tips
Your route passes through protected areas
Please check local regulations for:
Waypoints
Start point
Parking
Get Directions
6.50 km
Footbridge over the Semois at Mouzaive
Highlight • Bridge
Translated by Google •
Tip by
7.23 km
Naglémont Viewpoint
Highlight • Viewpoint
Translated by Google •
Tip by
18.6 km
Pont de Claies (Semois)
Highlight • Bridge
Translated by Google •
Tip by
44.9 km
End point
Parking
Way Types & Surfaces
Way Types
31.2 km
8.06 km
1.89 km
1.82 km
1.72 km
224 m
Surfaces
26.0 km
5.80 km
5.29 km
3.53 km
2.41 km
1.63 km
224 m
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Elevation
Highest point (400 m)
Lowest point (180 m)
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Weather
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Wednesday 20 May
22°C
8°C
0 %
Additional weather tips
Max wind speed: 7.0 km/h
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This route was planned by komoot.
Frequently Asked Questions
How long does it typically take to jog the L'Alletante 45K trail?
This challenging 45K route is designed for experienced joggers and typically takes around 6 hours to complete, depending on your pace and stops.
Is this trail suitable for beginner joggers?
No, the L'Alletante 45K is considered a 'hard' run, requiring very good fitness, sure-footedness, and sturdy shoes. It features significant elevation gain (over 1600 meters) and varied, often technical terrain, making it unsuitable for beginners.
What kind of terrain can I expect on the L'Alletante 45K?
The trail offers diverse terrain, including regular paths, hiking paths, and smaller sections of road and footpaths. A significant portion is unpaved, with natural and gravel sections. You'll encounter steep ascents and descents, uneven surfaces, 'crêtes' (ridges), 'dévers' (slopes), and sections that demand careful footing.
What are the main highlights or viewpoints along the route?
The trail offers breathtaking scenery. You'll follow the meandering Semois River, pass through dense forests, and enjoy panoramic vistas from exceptional viewpoints like the Naglémont Viewpoint. A unique feature is the Pont de Claies, an original hurdle bridge, and you'll also pass through old mine passages.
Are dogs allowed on the L'Alletante 45K trail?
Yes, dogs are generally allowed on trails within the Semois Valley National Park. However, it is essential to keep them on a leash to protect wildlife and ensure the safety and comfort of other trail users.
Do I need a permit or is there an entrance fee for the Semois Valley National Park?
There are no specific permits or entrance fees required for general access to the trails within the Semois Valley National Park, including the L'Alletante 45K route.
What is the best time of year to jog this trail?
The Semois Valley National Park is beautiful year-round, but spring and autumn offer particularly pleasant conditions with milder temperatures and vibrant foliage. Summer can be warm, while winter may present icy or muddy conditions, adding to the challenge.
Where can I find parking for the L'Alletante 45K trailhead?
The L'Alletante 45K passes through or near several charming villages such as Alle-sur-Semois, Mouzaive, Vresse, Laforêt, and Chairière. While no specific trailhead parking is listed, you can typically find parking in these villages to access the route.
What should I pack for this challenging run?
Given the trail's difficulty and length, it's crucial to pack sturdy trail running shoes with good grip, sufficient water and nutrition, appropriate layers of clothing for changing weather, a first-aid kit, and a reliable navigation device or map.
Does the L'Alletante 45K intersect with other well-known paths?
Yes, the route shares sections with several other trails, including the GRP 161 Tour du Pays de Bouillon Parcours principal, the GR 16 Sentier de la Semois, and the European long distance path E3 - part Belgium, among others.
Are there any facilities like cafes or restrooms along the trail?
The trail passes through or near several small villages like Alle-sur-Semois and Vresse, where you might find local cafes, restaurants, or public restrooms. However, facilities are not consistently available directly on the trail, so plan accordingly.