The triathlon will make its debut at the Sydney Olympic Games with competitions set for September 16 and 17. The event will comprise a 1.5-kilometre swim around Farm Cove in Sydney Harbour, a 40 km bike and a 10 km race around the Sydney Opera House and the surrounding Royal Botanic Gardens and Domain. The women's triathlon will be the first event. Women are expected to finish in just two hours; men in about 1 hour 50 minutes. The women will race on the opening morning of the Games, followed by the men the next morning. Each race will have no more than 50 competitors. Australia, as host country, is automatically entitled to take part. World rankings determine the other entrants and are limited to three per country for each race. The United States, Canada, Australia, New Zealand and Britain have dominated the triathlon in the past. Australia is currently top in both men's and women's competitions. The event dates back to 1978, Hawaii, where an Ironman triathlon was generally regarded as the world's first official triathlon.