Toughest Races in the World
Toughest Races in the World # 6
Barkley Marathon has attracted several people, but only few have succeeded to cross the finish line. To give you a clearer picture, only seven people have completed the race since the time it was started in 1986. The Barkley Marathon pushes you through a course of five 20 mile loops through Tennessee's Frozen Head State Park.
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