The Trail du Bostet - 21 km is a trail race in Naves, a village in the Savoie department of the French Alps. The race begins in the afternoon and offers runners 21 km of mountain-style running with 750 meters of elevation gain, presenting a compact yet challenging course instead of a flat road race.
The series also features an 11 km option, taking place in the same location and starting at the same afternoon time. Team Bostet organizes the event, and Kikouroù lists multiple editions for both the 11 km and 21 km races. While the listing lacks detailed route notes, the distance, climb, and Savoie setting suggest a local trail event focused on uphill and downhill running rather than speed on pavement.