A panorama of Sydney, the most populous city in Australia with a population of 4.4 million, at dusk, with the Sydney Opera House on the left and Sydney central business district on the right. The site of the first British colony in Australia, Sydney was established in 1788 at Sydney Cove by Arthur Phillip, commodore of the First Fleet. The city is built on hills surrounding Sydney Harbour—an inlet of the Tasman Sea on Australia's southeastern coast.Photo credit: David Iliff