The largest nation in Oceania, in both size and population, is Australia. (Only part of Indonesia is in Oceania.)
Indonesia
Sydney, Australia. It has 4.5 million people.
australia
Shanghai, China is the largest city by population.
Lagos, Nigeria is the African city with the largest population.
The Australian city with the largest population is Sydney.
Mexico City is the world's second largest city by population.
The exact definition of Oceania varies, including whether or not it encompasses Australia. The most common definition of Oceania does include Australia, therefore the most populous city in Oceania is commonly believed to be Sydney, followed by Melbourne and Brisbane.
Dublin city would be the city with the largest gay population in Ireland.
Edinburgh is the capital city of Scotland and it is the second largest city. The largest city in Scotland is Glasgow.
Mexico City is the largest city in North America by population.