River of No Return Endurance Runs – 108k

Challis, ID

55K100K108K

Community-sourced race analytics for ultramarathons across the United States.

Browse freely — sign in to submit events or contribute photos.

Privacy Terms Health disclaimer AI disclosure

Platypus Ultras is powered by community contributions. Content may be incomplete or incorrect—please verify on official race websites before making plans.

Corrections or questions? admin@platypusevolution.com