The sport has the official site chicagomarathon.com . Hardrock Hundred Mile Endurance Run was established on 1963 . The venue for Hardrock Hundred Mile Endurance Run was Riocentro – Pavilion 6 . 17 teams competed in Hardrock Hundred Mile Endurance Run . 136 from 25 nations were the competitors in Hardrock Hundred Mile Endurance Run . It was held in 11 August – 28 August
More than 9 nations participated in the event