The Duathlon d'Istres is a short-format run-bike-run race held in Istres, located in the Bouches-du-Rhône department of southern France. Taking place in late March, it is organized by Istres Sports Triathlon. The S-distance format is open to athletes aged 16 and over, with options for individual entries and relay teams, catering to beginners, club athletes, and those wishing to share the effort.
The course winds through the ponds surrounding Istres, providing a local Provence setting distinct from a large urban environment. This event, initiated by the local triathlon club, is part of the early-season regional calendar for Provence-Alpes-Côte d'Azur. It is not part of a larger series, emphasizing the standalone race day and the surrounding club community.