| State/territory |
Northernmost point |
Southernmost point |
Easternmost point |
Westernmost point |
| Australian Capital Territory |
35°07′28″S 149°07′20″E / -35.12444, 149.12222 |
35°55′15″S 149°02′48″E / -35.92083, 149.04667 |
35°19′10″S 149°23′58″E / -35.31944, 149.39944 |
Mount Franklin Road |
| New South Wales |
Point Danger |
Cape Howe |
Ball's Pyramid |
Western border with South Australia |
New South Wales
(excluding Lord Howe Island) |
Point Danger |
Cape Howe |
Cape Byron |
Western border with South Australia |
| Northern Territory |
northern tip of Oxley Island |
southern border with South Australia |
eastern border with Queensland |
western border with Western Australia |
| Queensland |
Bramble Cay, Torres Strait |
Dumaresq River near Watsons Crossing |
Boat Rock, off Point Lookout |
western border with the Northern Territory |
| South Australia |
northern border with the Northern Territory and Queensland |
Ruby Rock, in Discovery Bay |
eastern border with Queensland and New South Wales |
western border with Western Australia |
| Tasmania |
Boundary Islet |
Bishop and Clerk Islets, near Macquarie Island |
Judge and Clerk Islets, near Macquarie Island |
Diamond Rock, off New Year Island near King Island |
Tasmania
(excluding Macquarie Island) |
Boundary Islet |
Pedra Branca |
Gull Rock, off Gull Island near Cape Barren |
Diamond Rock, off New Year Island near King Island |
| Victoria |
NW corner of the state |
Boundary Islet |
Cape Howe |
Western border with South Australia |
| Western Australia |
Cape Londonderry |
South West Island, near Eclipse Island (Western Australia) |
eastern border with South Australia and the Northern Territory |
western tip of Dirk Hartog Island |