This event is in the past.It took place on April 12, 2026 at Gymnasium Of The Rights Of Man.
TrackTrackLace up for the 30th edition of this beloved trail classic through the Bièvre river springs. Choose your challenge from 22 km of hilly forest trails to a gentle 11 km nature run, plus Nordic walking and kids' races that make it a true family affair.
30th anniversary edition
forest trail racing
family-friendly event
Nordic walking
Tips
🏃22 km trail has aid station at km 12
🏅every finisher gets a prize
🔒locker service available at gymnasium
La Guyancourse
Guyancourt
TrackTrackLace up for the 30th edition of this beloved trail classic through the Bièvre river springs. Choose your challenge from 22 km of hilly forest trails to a gentle 11 km nature run, plus Nordic walking and kids' races that make it a true family affair.
30th anniversary edition
forest trail racing
family-friendly event
Nordic walking
Tips
🏃22 km trail has aid station at km 12
🏅every finisher gets a prize
🔒locker service available at gymnasium
Make it an outing
Add nearby spots before or after your event