The Barkley Marathons is an unusual ultramarathon event that has been held annually in the park since 1986. Competitors are challenged to run a course in under 60 hours. The course is unmarked and traverses very rugged and brushy terrain.Lisa Jhung, The Impervious Barkley Marathons, Runner's World, April 6, 2010. Retrieved December 22, 2010. As of 2023, only seventeen competitors have ever finished the race.Matt Mahoney, Barkley Marathons Results by Year.
