The Gold Coast Broadwater, also known as Southport Broadwater, Gold Coast Harbour and The Broadwater, is a large shallow estuary of water located in the Gold Coast district of South East Queensland, Australia. The estuary reaches from the locality of Southport in the south, to the southern section of the UNESCO World Heritage Listed Moreton Bay in the north. Separated via the Seaway from the Coral Sea by a thin strip of land called Stradbroke Island, the original body of water was a lagoon created from water deposited from the Nerang River. Part of the Broadwater is contained within the Moreton Bay Marine Park.

The Gold Coast, often referred to by its initials G.C., is the second-largest city of Queensland, Australia, after Brisbane. It is Australia's sixth-largest city, the most populous non-capital city, and the state's after Brisbane, with a population over 600,000. The Gold Coast is a coastal city and region located approximately 66 kilometres (41 mi) south-southeast of the centre of the state capital, Brisbane. The city's central business district is located roughly in the centre of the Gold Coast in the suburb of Southport. The urban area of the Gold Coast is concentrated along the coast, sprawling almost 60 kilometres, joining up with the Greater Brisbane metropolitan region to the north and to the state border with New South Wales to the south. Nicknames of the city include the ‘Glitter Strip’ and the ‘Goldy’. The demonym of a Gold Coast resident is Gold Coaster.