You are not at the top of the food chain here, so better run fast!

That's right: The Wolf, the Coyote, the Fox, the Bear, the Cougar: you are not at the top of the food chain here, so Run Fast.

With a start and finish in Challis, Idaho (32K Start-Bayhorse), the River of No Return (RONR) Endurance Runs offer runners a unique opportunity to experience Idaho’s beauty.

Choose between distances of 32k, 55k, or 108k, where you’ll be challenged by varying terrain and awed by gorgeous scenery. Designed to be tough and beautiful, the courses tour some big mountain climbs over 9000 feet. Elk, deer, eagles, bears and wolves add to the mystique of the River of No Return, as do the forgotten mines and mining communities, old Idaho traditions – all surrounded by the very supportive community of Challis.