13th River of No Return Endurance Run 53K
13th River of No Return Endurance Run 53K is a 55 km ultramarathon in Challis, ID, United States, taking place on Jun 20, 2026. This edition has already taken place.
- Date
- Jun 20, 2026
- Distance
- 55 km
- Location
- Challis, ID, United States
- Format
- Fixed distance