kacacelan.de Watch the highlights from the awesome Ironman World Championship held at. 20th Annual Las Vegas Triathlon. & Duathlon. Saturday, September 30, Boulder Beach, Lake Mead National Park, Nevada. Half, Olympic, Sprint. Known by many as a half Ironman, the Ironman races in Las Vegas, NV are an excellent goal for triathletes looking for a new challenge. Learn more about. Sa., Juli.