Kardingebultra

Kardingebultra is a 160.9 km paved road ultramarathon held in Groningen, in the Dutch province of Groningen. Organized by Steenboksport, it is listed as a July event. The race details are limited: it starts in Groningen on a paved surface, and registration is through Inschrijven.nl. The 160.9 km distance, the metric equivalent of 100 miles, is its distinguishing feature, designed for experienced ultra runners rather than casual road racers.