The large island that is home to the city of Sydney is Australia. Sydney, known for its iconic landmarks such as the Sydney Opera House and Sydney Harbour Bridge, is Australia's most populous city. The island features abundant natural beauty, stunning coastlines, and a vibrant culture. Visitors to Sydney can experience a mix of outdoor activities, dining, and entertainment options. As a major urban center, it serves as a gateway to exploring Australia's diverse landscapes and unique wildlife, often attracting tourists from around the world.