The Duathlon Pays de Brie is a run-bike-run event held in Chailly-en-Brie, located in Seine-et-Marne, east of Paris. Typically taking place in early March, it features short-course XS and S formats, alongside youth races and an open S race for adults.
The race headquarters are situated at Lycée La Bretonnière on Rue de la Gare, with Coulommiers Brie Triathlon serving as the organizer. This event also functions as a youth qualifying race for the French duathlon championship. Consequently, the participant list may include young athletes aiming for selection, as well as adults competing in the open race. Drafting is permitted in the S Open format.