Named for Corio Bay, it has always been based on the city of Geelong, although in the past it stretched as far east as the outer western suburbs of Melbourne.

Presently, the Liberal Party need a near 13 percent swing to win it.

Since 1984, federal electoral division boundaries in Australia have been determined at redistributions by a redistribution committee appointed by the Australian Electoral Commission.

[2] The division comprises an area of 773 square kilometres (298 sq mi) from the western shores of Port Phillip Bay, stretching to the north of Geelong and inland.

Besides Geelong, it includes Avalon, Bell Park, Bell Post Hill, Belmont, Breakwater, Corio, Drumcondra, Fyansford, East Geelong, North Geelong, South Geelong, Geelong West, Hamlyn Heights, Herne Hill, Highton, Lara, Lovely Banks, Manifold Heights, Moolap, Newcomb, Norlane, North Shore, Portarlington, St Albans Park, Rippleside and Whittington; and parts of Anakie, Batesford, Clifton Springs, Fyansford, Leopold, Newtown, and Thomson.