Dangar Island is a forested island, 29 hectares (72 acres) in area, in the Hawkesbury River, just north of Sydney, New South Wales, Australia. Dangar Island is a suburb of Hornsby Shire and as at the 2011 Census had a population of 267, which swells dramatically during holiday seasons. The island is serviced regularly by Brooklyn Ferry Service and departs from Brooklyn and takes about ten minutes. The Brooklyn ferry is itself adjacent to Hawkesbury River railway station. The ferry service is in operation 7 days a week.