Trail des étangs - Cergy is a nature race held early in the year around the ponds of Cergy, organized by Les Feux Follets. It provides two trail distances: a 10 km initiation run for those new to off-road racing, and an 18 km short trail for runners seeking a more challenging run.
The 10 km course features modest climbing, with several small hills instead of continuous ascents. The 18 km route requires more effort, including approximately 400 metres of elevation gain. This setup allows runners to select between a moderate start to the racing year and a more strenuous winter trail event.