Gymea Bay is a bay on the upper estuarine Port Hacking River.The locality of Gymea Bay is on the southern shore of the Coonong Creek estuary where it flows into Gymea Bay and where Gymea Bay Road once reached the river (now a private road). The locality developed around the Gymea Bay Post Office and shops at the intersection of Gymea Bay Road and Sylvania Road South (now renamed Casuarina Road and Greygum Road).The suburb of Gymea Bay is a suburb in southern Sydney, in the state of New South Wales, Australia. Gymea Bay is south of the Sydney central business district, in the local government area of the Sutherland Shire. The postcode is 2227, which it shares with the adjacent suburb of Gymea.The suburb of Gymea Bay takes its name from the small bay on the north side of the Port Hacking estuary (also known as the Port Hacking River). The suburb included only the area of the single peninsula between Gymea Bay and the North West Arm of the Port Hacking River and bounded by Coonong Creek on the north and, on the west, by an unnamed creek flowing south of Gymea Bay Road between Barraran Street and Coonong Road.In 2008, The New South Wales Geographical Names Board suggested a much enlarged area for the suburb of Gymea Bay, taking in much of former Gymea and even part of the suburb of Miranda, in which the suburb's extremities are defined by Forest Road on the northeast, Avenel Road on the north, Dents Creek on the west, and the waters of North West Arm and the bay itself to the south. These boundaries remain contentious.
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