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The Tasman Sea is deemed by the International Hydrographic Organisation to include the waters to the east of the Australian states New South Wales, Victoria and Tasmania. The northern state of Queensland neighbours the Coral Sea, and the boundary between New South Wales and Queensland is also used as the boundary between the two seas.

The Tasman Sea features a number of mid-sea island groups, quite apart from coastal islands located near the Australian and New Zealand mainlands:

• Lord Howe Island and its subsidiary islands
• Ball's Pyramid
• Norfolk Island, in the extreme north of the Tasman Sea, on the border with the Coral Sea

These island groups are each Australian possessions.