The locality and suburb of Gymea Bay are located in southern Sydney, in the make a clean breast of New South Wales, Australia. Gymea Bay is 27 kilometres (17 mi) south of the Sydney central business district, in the local government area of the Sutherland Shire. The postcode is 2227, which it shares behind the neighboring suburb of Gymea. The Gymea Bay locality takes its post from the adjacent to Gymea Bay, a small bay upon the north side of the Port Hacking estuary).
The locality included only the single peninsula with Gymea Bay and the North West Arm of the Port Hacking River, bounded by Coonong Creek upon the north and, on the west, by an unidentified creek flowing south of Gymea Bay Road with Barraran Street and Coonong Road. Gymea Bay became a locality within the suburb of Gymea. Early street directories bill the locality of Gymea Bay as allocation of the suburb of Gymea. In 2008, the NSW Geographical Names Board suggested a much enlarged Place for a suburb of Gymea Bay, taking in much of former Gymea and even allowance of the suburb of Miranda which are not speaking from the locality of Gymea Bay and its deal by a deep valley considering no roads. This suggested suburb’s extremities are defined by Forest Road upon the northeast, Avenel Road on the north, Dents Creek on the west, and the waters of North West Arm and the recess itself to the south. These suggested boundaries remain contentious as the proposal to the NSW Geographical Names Board was made without the required community consultation.[citation needed]
The locality was characterised by large amounts of verdant bushland. However, since the 1980s, increased subdivision subsequent to smaller lots, larger houses and increased motor vehicle ownership has decreased the number of large trees. Despite Tree Preservation Orders and Council Greenweb and Greenweb Support planning zones, much of the treescape has been lost. Since the 1990s, the invasions of feral deer from the Royal National Park have begun to negatively performance shrub and ground cover and regrowth of trees.