The Georges River, also known as Tucoerah River, is an intermediate tide dominated drowned valley estuary, located to the south and west of Sydney, New South Wales, Australia.The source of the Georges River is upland swamps of the O'Hares Creek catchment, approximately 80 kilometres (50 mi) to the south-west of Sydney central business district between the town of Appin and the Illawarra Escarpment.