The Ironman World Championship has been held annually in Hawaii since 1978, using an additional race in 1982. It’s owned and organized by the World Triathlon Corporation. It is the annual culmination of a collection of Ironman triathlon qualification races held throughout the world.
From 1978 through 1980 the race has been held to the island of Oahu, the path combining that of 3 events already held there: the Waikiki Roughwater Swim (2.4 mi. /3.86 kilometers ), the Around-Oahu Bike Race (115 mi. /185.07 kilometers, originally a two-day event), and also the Honolulu Marathon. The bike stage was decreased by 3 kilometers to connect it Marathon course. In 1981 the race has been transferred into the less urbanized Big Island, keeping the spaces exactly the same: a 2.4 kilometers (3.86 km) open water swim at Kailua-Kona Bay, a 112 kilometers (180.25 kilometers ) bike ride across the Hawaiian lava desert to Hāwī and back, along with a marathon (26 miles 385 yards, 42.195 kilometers ) run across the shore of the Big Island from Keauhou into Keahole Point and back to Kailua-Konaand finishing on Aliʻi Drive.