Ectu, the Évry-Courcouronnes Trail Urbain, is an urban trail race held at the Complexe sportif du Lac in Évry-Courcouronnes, Essonne. It takes place in March, with activities at the venue before the races and walks commence. The event offers runners four distances: 5 km, 10 km, 15 km, and 20 km, suitable for a short local run or a longer urban trail effort.
The courses feature moderate climbing, not entirely flat: approximately 25 meters of elevation gain on the 5 km, 50 meters on the 10 km, 75 meters on the 15 km, and 100 meters on the 20 km. A notable aspect is that the event is organized by students, with backing from the city of Évry-Courcouronnes and local partners such as Génopole, Croix Blanche, Décathlon Évry, Comunikey, and ACEF - Banque Populaire.