UTDS spirit
A human adventure in the heart of the Belgian Ardennes.
More than just a race
The UTDS isn’t just a series of miles and elevation gain. It’s a human adventure.
An immersive experience in the heart of the Belgian Ardennes, where each participant comes seeking something different: a challenge, a thrill, a chance to push their limits, a reconnection with nature, or simply the desire to fully embrace a timeless moment.
To each their own challenge
At UTDS, performing well means, above all, progressing at your own pace
For some, it will be their first 10K run.
For others, it means driving 160 kilometers through the night.
Every challenge deserves respect.
No matter the distance, what matters is the journey
Trail spirit
Our Core Values
Pushing limits
To push oneself beyond one's limits, with courage and perseverance
humility
Remain humble in the face of nature, the elements, and oneself
RESPECT
Respect other runners, volunteers, local residents, and the areas you pass through
SOLIDARITY
Mutual support and sharing are at the heart of the trail running experience
INCLUSION
An event open to everyone, without exception.
RESPONSABILITY
Taking action to protect the environment and the future of our trails
Respect for nature
The Ardenne is not just a backdrop. They are at the heart of the UTDS experience.
Every participant commits to acting responsibly: leaving no trace, staying on the trails, and preserving the untamed beauty of our forests and valleys.
Volunteers: Our Strength
Behind every aid station, every marker, every word of encouragement, and every smile, there are passionate men and women who volunteer their time to make the UTDS a success.
Let’s show them respect and thank them—they’re part of the adventure!
A community
The UTDS aims to foster an open, supportive, and passionate trail running community. Here, we share values, emotions, and memories that last long after we cross the finish line.
The Belgian Ardenne
Charming villages, dense forests, rivers, mountain ridges, and a unique cultural heritage: our trails wind through an authentic region that we are fortunate to be able to share with others. Let’s take care of it and be its ambassadors.
No matter the distance.
No matter the time.
Only matters your experience here.
An adventure. An encounter. A story