Much of the land of Sylvania Waters was 'reclaimed' from Gwawley Bay, effectively destroying the highly integrated mangrove flora of the bay. Sylvania Waters Estate was developed by L.J.Hooker in the 1960s; land offered had water frontages with boating facilities. Streets were named after Australian rivers to emphasise the association with water, such as Shoalhaven, Tweed, Murrumbidgee, Hawkesbury and Barwon. The suburb has been identified as an area that is particularly vulnerable to inundation, should predictions of climate change, global warming and rising sea levels prove correct.