MELBOURNE has again been rated the world's most liveable city - for the third year in a row.
The Victorian capital edged out Vienna, Vancouver, Toronto and Calgary to claim the top ranking by The Economist Intelligence Unit.
Three other Australian cities were in the top 10 - Adelaide (5), Sydney (7) and Perth (9).
Issues covering stability, healthcare, culture, environment, education and infrastructure were considered in the survey.
"Improvements to infrastructure in Australia, where the federal government initiated an ambitious long-term road-building programme in 2010, prompted rises in some cities in 2011," the report said.
The worst ranked cities were Tehran, the Cameroon capital Douala, Tripoli, Karachi, Algiers and Harare, Lagos and Port Moresby.
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