Duo en Dombes - Birieux 2027

Duo en Dombes - Birieux is a trail race held in Birieux, Ain, France. The next edition is scheduled for early March. The primary offering is a 10 km trail, which is also the most attended distance. The 10 km route has no recorded elevation gain, meaning the difficulty lies in maintaining pace and sure-footedness rather than ascending. The prior event attracted more than 100 runners, contributing to its local character instead of a large-scale gathering.