The Semi-Marathon de Liffré is a 21.0975 km road race held in Liffré, a town in Ille-et-Vilaine, Brittany, near Rennes. Typically run in early April, the half marathon begins in the morning and is open to runners from the junior category upwards. The event also features races for children and juniors, catering to a range of age groups. It holds a national FFA label and qualifies participants for the French Championship, lending a competitive atmosphere to the local event.
The course is designed for speed, consisting of two identical road loops with a downhill start and a finish on Rue Jules Ferry in central Liffré. Runners navigate the town center, rural roads, and the Rennes forest, with aid stations provided every 5 km. The race encourages fast times, evidenced by course records of 1:04:12 for men (Paul Njoroge Mugo) and 1:13:11 for women (Dorine Murkomen), with a cash bonus offered for any new record. While beginners are welcome, the flat, rolling course also attracts athletes aiming for personal bests or championship qualification.