SYDNEY (AFP) - Melbourne has edged out long-time front-runner Vancouver to be rated the worlds most liveable city, a worldwide survey from the Economist Intelligence Unit said Tuesday. The Australian metropolis topped the Global Liveability Surveys ranking of 140 cities worldwide, ahead of Canadas Vancouver which dominated the rankings for almost a decade but is now third behind the Austrian capital, Vienna. Australian cities featured prominently in the top 10, with Sydney ranked sixth and Perth and Adelaide in joint eighth place, according to the survey, which is conducted twice a year. Canada also did well, with Toronto and Calgary holding fourth and fifth places respectively. Helsinki in Finland (seventh) and New Zealands Auckland (tenth) rounded out the top 10. Cities were scored on political and social stability, crime rates, access to quality health care, cultural events, the environment, education and the standard of infrastructure. Australia, with a low population density and relatively low crime rates, continues to supply some of the worlds most liveable cities, said survey editor Jon Copestake.