one day single stage trail race taking place every year in the south of Tunisia between the towns of Tozeur and Douz. The 100km distance shall be covered in less than 20hours. Participants will start the race at sun rise in Tozeur and will run through the day and into the night to reach the historic town of Douz. There will be 5 checkpoints situated every 15-20km offering water (limited to a bottle of 1.5L per 5km per runner), medical assistance and guidance.