The Ultraman World Championships is a 3-day 320-mile (515-kilometer) individual ultra-endurance event which takes place on the Big Island of Hawaii.
Entry is limited to 40 participants and is by invitation only. Founded in 1983, the event is held annually on the traditional Thanksgiving Weekend.
See also the Ultraman event in Australia.
6.2 mile ocean swim
+ 90 mile cross country bike ride
171.4 mile bike ride
52.4 mile double marathon run