The 24 heures de Ploeren is a timed running event held in Ploeren, Morbihan, Brittany. Runners select their duration: 6 hours, 12 hours, or the full 24 hours. A 24-hour relay option is also available for teams.
The race is structured around a 1 km loop, emphasizing repetition, pacing, nutrition, equipment, and sustained effort over many hours. Solo runners face a pure endurance challenge, while relay teams can divide the overnight running among friends or club members. All participants are issued a bib, and entrants must review the mandatory equipment requirements prior to the event.