Silverwater is a suburb in western Sydney, in the state of New South Wales, Australia. Silverwater is located 15 kilometres west of the Sydney central business district on the southern bank of the Parramatta River within the local government area of City of Parramatta.

The Parramatta River is an intermediate tide-dominated, drowned valley estuary located in Sydney, New South Wales, Australia. With an average depth of 5.1 metres (17 ft), the Parramatta River is the main tributary of Sydney Harbour, a branch of Port Jackson. Secondary tributaries include the smaller Lane Cove and Duck rivers.