The 100 km de Crevin is a road ultra starting in Crevin, France, where runners have 16 hours to complete 100 kilometers. Organized by Les courses de la Vallée du Semnon, Philippe Evalet is the event contact. The 100 km is the longest event on the schedule, which also features a marathon, a half marathon, and a 10 km, meaning the day caters to more than just ultrarunners.
The course starts with a single 15.6 km lap without a pacer, followed by four 21.1 km laps. The route combines town sections with more natural environments, offering runners a familiar loop with varied terrain. The 100 km field is small and competitive, typically comprising a few dozen men and about ten women. In recent years, winning times have been under seven hours for men and under eight hours for women.