Ultra Tour des Sources(UTDS)

The Ultra Tour des Sources (UTDS) is a permanent marked route for trail runners and Nordic walkers in XXL format, covering 157 KM with 4140 m of positive elevationLocated in the east of Belgium, this route links the 7 communes of the province of Liège included in the EXTRATRAIL network (Spa, Stoumont, Jalhay, Stavelot, Theux, Trois-Ponts & Malmedy).

Designed for athletes who want to take on an intensive challenge, it is also great for trail runners and walkers who want to explore.

You are free to organise your journey by defining the daily distances and points where you will sleep, eat and refuel. However, the Tourist Information Offices in the towns and communes you come across will be able to offer advice and help with any reservations.

You are also free to design your route by selecting one or more sections of this extensive route and planning potential transfers by taxi or bus.

ExtraTrail UTDS: an ultra trail with multiple attractions

By taking the UTDS, you will experience the best of the EXTRATRAIL routes with a variety of really exceptional landscapes, biotopes and heritage (natural and constructed).

A unique experience where you will discover all the highlights of our region whilst immersing yourself in a preserved natural environment in the heart of the Pays des Sources.

Parcours d'Ultratrail permanent dans les Ardennes belges

On the ground, the Ultra Tour des Sources is marked by the classic Extratrail markers which have a pink ‘UTDS’ sticker on them.

The ideal is to start the UTDS from the tourist office of one of the 7 communes integrated into the EXTRATRAIL network (tourist offices in Spa, Stoumont, Jalhay-Sart, Stavelot and tourist information centres in Theux, Trois-Ponts or Malmedy).

Ultra Tour des Sources (UTDS)  | TEMPORARY CLOSURE FROM 15/09/2019 TO 28/02/2020


Colour: Pink
Distance: 157 KM
Elevation: 4140 metres
Duration: 20 hours - 5 days
Difficulty: +++++
Departures (choice):

Spa Tourist Information Office (city centre)
Stoumont Tourist Information Office (centre of the village)
Jalhay-Sart Tourist Information Office (Place de Sart)
Gileppe dam car park (Jalhay)
Stavelot Tourist Information Centre (city centre - abbey)
Theux Tourist Information Office (city centre)
Trois-Ponts Tourist Information Office (city centre)
Malmedy Tourist Information Office (city centre - Malmundarium)
Robertville dam car park (Waimes)


Food and drinks essential.
Mobile phone essential.
Survival blanket and whistle recommended.
Headlamp and spare batteries essential.
Technical equipment adapted to the variable weather conditions (warm and waterproof clothing) essential.
This route is very technical: roots and stones may be extremely slippery when conditions are humid.

Perfect knowledge of your sporting and physical abilities is required for a challenge that may be particularly demanding on your body. Never commit to such a distance without preparation and without undergoing a medical check.
The route crosses part of the Fagne. Climatic conditions can be very changeable. Never stray from the marked route, especially during fog or snow. Check the accessibility (red flag) of the Hautes Fagnes Nature Reserve.


Unless indicated otherwise, the UTDS is open between the 1st of January and the 15th of September every year.
During the hunting season (15th of September – 31st December, unless exceptionally extended by the competent ministry), the Ultra Tour des Sources is not accessible. You are asked not to enter the forest between 5pm and 10am. During this period, some sections may be completely closed due to culling.

For your safety and to respect the fauna, flora and other forest users, never take a route that is closed for hunting or logging.

Click on the map to see the path.

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