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The International Association of Ultrarunners (IAU) is the world governing body of ultra running, race events longer than the marathon distance of 42.2 km. It regulates and sanctions the World Championships for various ultramarathon distances, and tracks world records in ultra distance races approved by IAU.
The road running event was later upgraded to World Championships status after 2006. It is one of the IAU's four main world championship events (alongside the 100 km World Championships, 50 km World Championships, and Trail World Championships) and is the only one with a limited time format, rather than a distance-based one. [4]
Addo Elephant Trail Run United States: American River 50 Mile Endurance Run United States: Angeles Crest 100 Mile Endurance Run United States: Barkley Marathons United States: Bear 100 Mile Endurance Run Canada: Canadian Death Race Nicaragua: Fuego y Agua 25k,50k,100K & Survival Run United States: Grand Canyon Ultra Marathon Réunion
Many new races have come into inception, covering a range of ultramarathon distances from 50 km right through to multi-day events. The cornerstone of Australian Ultra events is such races as Ultra-Trail Australia 100, The Great North Walk Ultras, Surf Coast Century, Bogong to Hotham, Alpine Challenge, GC50 Run Festival, and the Cradle Mountain Run.
Javelina Jundred is a 100 mile (160 km) ultramarathon held at McDowell Mountain Regional Park in Fountain Hills, Arizona.Founded in 2002, it is one of the most popular ultramarathons in the United States, with over 850 runners as of 2023. [1]
The 4 Deserts Ultramarathon Series is an annual series of four 250-kilometer (155-mile) races across deserts around the globe. [1] The races were recognized as the world's leading endurance footrace series by TIME magazine in 2009 and 2010, [2] as the "Ultimate test of human endurance". [3]
The Grand Slam of Ultrarunning is a set of four of the five most prestigious and oldest 100-mile races contested in the United States, comprising the Old Dominion 100 Mile Endurance Run in Virginia, the Western States 100 in California, the Vermont 100 Mile Endurance Run in Vermont, the Leadville Trail 100 in Colorado, and the Wasatch Front 100 Mile Endurance Run in Utah.
Ultra 4 Racing logo. The King of the Hammers was founded by Jeff Knoll [7] and Dave Cole in 2007, who organized it in a bar via outlining it on a napkin. [8] A trial run was conducted with 12 teams nicknamed the OG13. The OG13 are always invited back to race year after year. All past winners, dubbed "Kings", are also invited annually. [9]