Trail NBZ is based in Nébouzat, in central France, with routes set inside the Parc des Volcans d’Auvergne. It is a trail-running event with several distance options rather than a single race, and the program also includes a hike and a children's race.
The longest listed route, Le Pourcharet, is about 30 km with 1,024 meters of climbing, so it is the main mountain-style challenge of the day. La Gorce is 16.2 km with 458 meters of gain, while La Recoleine is just under 10 km with 301 meters of gain, giving runners a shorter but still hilly option in volcanic Auvergne terrain.