There are 2 towns and suburbs in Hornsby with an elevation of 4-10 metres above sea level
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Brooklyn is a town in the state of New South Wales, Australia, in the local government area of Hornsby Shire with a population of 722 as of the 2016 census.
Dangar Island is a forested island, 30.8 hectares (76 acres) in area, in the Hawkesbury River, just north of Sydney, New South Wales, Australia.