L'HourCancilloise features a runner-cyclist team circumnavigating the Hourtin-Carcans lake in Gironde, on France's Atlantic coast. The primary Bike & Run event is the historic race: approximately 57 to 60 km where one partner runs and the other cycles, with roles exchanged throughout. The broader weekend in Hourtin and Carcans-Maubuisson includes road running, trail running, walking, and shorter races, typically held in April. Distances offered range from a 10 km road race and a half marathon to 11 km and 20 km trail runs, alongside other formats culminating in the lake-loop Bike & Run.
The race route winds through pine forests, along the lake shore, and near the ocean side of the Medoc, with the main team race encircling one of France's largest natural freshwater lakes. The Bike & Run requires partners to remain visible to each other, manage bike handoffs, and cross the finish line together without pausing. The trail races offer a distinct atmosphere, featuring night runs illuminated by headlamps, set between woodland and water. The event attracts friends, families, club athletes, and pairs of varying abilities, as the format values pacing, cooperation, and strategic planning as much as pure speed.