Trail du Bois Joli is a late-winter nature race held in Tréméreuc, a small commune in Côtes-d’Armor, France, situated between Dinan, Saint-Malo, and Dinard. The primary distance is approximately 16.8 km, though some listings state 16.6 km; this distance is the most chosen option. It is a focused local trail event, not a large festival, with a participant limit of 300 runners.
The route follows the paths surrounding the Bois Joli water reserve, passing by lakes and ponds, including the Lac Frémur vicinity. The course is designed in a figure-eight pattern, featuring a single aid station near the 8 km mark, requiring participants to be self-sufficient for the majority of the race. Dinan Triathlon is the organizing body, and the event is part of the Crédit Agricole Pays de Dinan challenge, securing its spot on the local running schedule for club athletes and those seeking a manageable trail race in Brittany.