The Raid du Golfe du Morbihan 100 km begins at noon in Vannes, Morbihan, Brittany, giving participants 20 hours to complete the course. This 100 km trail and ultra race features 380 meters of elevation gain, meaning the primary challenge lies in distance, time on feet, and route navigation rather than significant climbing. The event is part of a larger June festival of endurance races surrounding the Gulf of Morbihan, offering alternatives for those seeking shorter trails or a much longer raid.
The series covers the 175 km Grand Raid, the 70 km Réveil des Ducs, the 56 km Arvor or Trail du Golfe, and La Ronde des Douaniers around 35 km. Some years also feature Nordic walking events, expanding the weekend beyond just the ultra race start. The 100 km has been featured in many editions, and the series has been held annually since at least 2013. The race page on Kikouroù contains numerous runner reports and videos, indicating a participant base with many experienced French trail and ultra runners who share practical insights about the event.