This historic 100km race in Biel-Bienne, Switzerland, is one of the oldest ultramarathons globally, contributing to the European Ultramarathon Cup. Participants embark on a single loop course, starting at night to traverse the scenic landscape under the stars. The race allows for team participation, accommodating groups of 2 or 5, while also offering a variety of additional events like a night marathon and Nordic walking. The challenging course showcases the beautiful surroundings, making it a unique experience for both solo runners and teams alike. The nighttime start adds an extra layer of excitement to this distinguished event.