The C100 StundenRunden is a 24-hour lap race held in Bergen, Bavaria, commencing Saturday morning and concluding Sunday morning in October. It follows a format inspired by Backyard Ultras, but it is a structured loop event utilizing the Bergener Moos and the town’s local facilities, rather than a last-runner-standing trail race in open country.
The Bergen swimming pool serves as the start, finish, and aid station area, meaning runners return to this central point between laps. TSV Bergen Trailrunning is the organizer, offering both individual and group entries. The race is designed for varied abilities, as participants can determine their distance within the time limit. Separate awards are given for reaching the 100-kilometer and 100-mile milestones.