A beautiful trail run with 50K & 100K, and options. 100K race (usually, but NOT in 2023) takes in the entire length of the Sheyenne National Grasslands section of the North Country Trail(link is external), SW of Fargo North Dakota.  Sections of wide open prairie, pockets of forest, and rugged, rolling 'sandhills' keep the race interesting.  This event is North Dakota's first ultramarathon.