In which city were the 2017 UCI Mountain Bike World Championships held; a city within the largest country in Oceania and the world's sixth largest country by total area?
2017 UCI Mountain Bike World Championships:  The world championships in cross-country and downhill were held in Cairns, Australia, from 5 to 10 September 2017. Australia:  It is the largest country in Oceania and the world's sixth-largest country by total area.
i don't know