(Reuters) - British ultrarunner Jasmin Paris became the first woman ever to finish the Barkley Marathons 100-mile race on Friday, completing one of the most challenging ultramarathons in the world with 99 seconds to spare in the 60-hour cut-off.

Paris was one of five ultrarunners to complete the annual race held in Frozen Head State Park, Tennessee that has seen no finishers in more than half the races in its nearly four-decade history.