Moesha Johnson has won Australia's first 10km open water world title as compatriot Kyle Lee opened the team medal tally with bronze in the men's race.
It is Australia's fifth open water world title over all distances with Johnson and Lee in the quartet that will defend the mixed team title at the Singapore world aquatics championships.
The water temperature was 30-plus degrees and conditions were described on social media as "human soup". There were also two postponements for the 10km events because of water quality concerns.