What water park is in the sixth-largest city in Australia?
WhiteWater World: WhiteWater World is a water park situated in the suburb of Coomera on the Gold Coast, Australia. Gold Coast, Queensland:  With a census-estimated 2016 population of 638,090, The Gold Coast is the sixth-largest city in Australia, making it the largest non-capital city, and the second-largest city in Queensland.
WhiteWater World