Ironman

Ironman World Championships: (External website)

AP News story: Ironman World Championships held in Hawaii from the 1970s to 2019;
and will be held in Utah in 2021: (External Link)

Early history of Triathlon: Started in Mission Bay, San Diego. The story of Jack Johnson, Don Shanahan, David Pain, and San Diego Track Club: (External Link)

Triathlon: (Wiki)