Monts de Blond Nature is a trail-running event in Cieux, a village in western France near the Monts de Blond. Runners can choose 10, 20, or 30 km trail routes, and there is also a 10 km canicross option for people running with their dogs.
The routes use paths through the Monts de Blond, focusing on off-road running in the countryside. A 10 km walk is offered the day before the races, and the series is organized by the local associations Pier'o' bois and Les Mali'Cieux.