sydneySydney is the capital city of the state of New South Wales and the most populous city in Australia and Oceania.Located on Australia's east coast, the metropolis surrounds Sydney Harbour and extends about 80 km (50 mi) from the PacificSydney Harbour National Park is a national park scattered across Sydney Harbour, Australia. First gazetted in 1975, it's one of many national parks within metropolitan Sydney, renowned for its sheltered beaches, tranquil picnic