Testathlon Armentières begins at the Base des Prés du Hem in Armentières, located on the Lys river in Hauts-de-France. This October multisport event features mountain biking, cyclathlon, trail running, and walking, with route options ranging from 5 km to 60 km.
The longer routes cover 60 km and 50 km, while shorter options include 30 km, 25 km, and 10 km, alongside walking distances. The event starts early in the morning and attracts nearly 1,000 participants, giving it the feel of a diverse outdoor sports gathering rather than a single-discipline competition.