Trail de l'Aven takes place in Melgven, a village in Cornouaille, Brittany. The event focuses on off-road running, offering race distances from 8 to 23 km. Additionally, walking routes range from 6 to 18 km, providing a more relaxed way to enjoy the countryside.
The courses feature forest paths and sections alongside waterways, emphasizing Breton tracks and local terrain over road speed. The longest option, Trail XS, covers 23 km with approximately 250 meters of elevation gain. Melgven also marks the start of the Challenge Armor-Argoat season, a series of trail events connecting South Finistère and Morbihan.