Trail de l'Arriu is an evening trail race held in Carresse-Cassaber, Pyrénées-Atlantiques. Starting from the Carresse Stadium, it features two running routes: a 13 km course with 250 m elevation gain, and a 17 km course with 320 m elevation gain. The 17 km race begins at 5:30 PM, with the 13 km race starting at 5:45 PM.
Additionally, a 9 km leisure walk is offered, featuring 150 m of climbing on a loop primarily on paths and through forests. This walk accommodates Joëlettes, making it accessible for participants with reduced mobility. The event also focuses on waste reduction through path cleaning with litter collection, requiring participants to use their own cup or a provided reusable cup, and employing reusable cups at the refreshment station.