Central Queensland is an ambiguous geographical division of Queensland (a state in Australia) that centres on the eastern coast, around the Tropic of Capricorn. Its major regional centre is Rockhampton and the Capricorn Coast and the area extends west to the Central Highlands at Emerald, north to the Mackay Regional Council southern boundary, and south to Gladstone. The region is also known as Capricornia. As this is an unofficial area, the boundary lines remain unclear causing some dispute over Mackay Regional Council as part of Capricornia and Central Queensland, or part of the Tropical North of Queensland. Residents of Mackay Regional Council can sometimes receive official mail from both Townsville and Rockhampton due to this regional dispute.