Map of the Tasman Sea
|Location||Western Pacific Ocean|
|Basin countries||Australia, New Zealand|
|Max length||2,800 km (1,700 mi)|
|Max width||2,200 km (1,400 mi)|
|Islands||Lord Howe Island, Norfolk Island|
|Settlements||Newcastle, Sydney, Wollongong, Auckland, Wellington|
|Benches||Lord Howe Rise|
The Tasman Sea is a southwesterly marginal sea of the South Pacific Ocean between Australia and New Zealand, approximately 2,000 kilometres (1,200 mi) across. It extends 2,800 km (approx.) from north to south. The sea was named after the Dutch explorer Abel Janszoon Tasman, the first recorded European to encounter New Zealand and Tasmania. The British explorer Captain James Cook later extensively navigated the Tasman Sea in the 1770s as part of his first voyage of exploration.
The Tasman Sea is commonly referred to in both Australia and New Zealand as The Ditch; for example, crossing the ditch means going to Australia from New Zealand or vice versa. In Māori, the Tasman Sea is called Te Tai-o-Rehua.
On the West. A line from Gabo Island (near Cape Howe, 37°30'S) to the Northeast point of East Sister Island (148°E) thence along the 148th meridian to Flinders Island; beyond this Island a line running to the Eastward of the Vansittart Shoals to [Cape] Barren Island, and from Cape Barren (the Easternmost point of [Cape] Barren Island) to Eddystone Point (41°S) in Tasmania, thence along the East coast to South East Cape, the Southern point of Tasmania.
On the North. The parallel of 30°S from the Australian coast Eastward as far as a line joining the East extremities of Elizabeth Reef and South East Rock ( ) then to the Southward along this line to the South East Rock [an outlier of Lord Howe Island].
On the East.
- In Cook Strait. A line joining the South extreme of the foul ground off Cape Palliser (Ngawi) and the Lighthouse on Cape Campbell (Te Karaka).
- In Foveaux Strait (46°45'S). A line joining the Light on Waipapapa Point [sic] (168°33'E) with East Head (47'02'S) of Stewart Island (Rakiura).
The Tasman Sea's mid-ocean ridge developed between 85 and 55 million years ago as Australia and Zealandia broke apart during the breakup of supercontinent Gondwana. It lies roughly midway between the continental margins of Australia and Zealandia. Much of Zealandia is submerged, so the ridge runs much closer to the Australian coast than New Zealand's.
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 (part of New South Wales)
- Ball's Pyramid (part of New South Wales)
- Norfolk Island, in the extreme north of the Tasman Sea, on the border with the Coral Sea (External Territory)
- Middleton Reef (part of Coral Sea Islands Territory)
- Elizabeth Reef (part of Coral Sea Islands Territory)
Adjoining bodies of water 
- North: Coral Sea
- Northeast and East: Pacific Ocean
- South and Southeast: Southern Ocean
- West: Bass Strait
Moncrieff and Hood were the first to attempt to a Trans-Tasman crossing by plane in 1928. The first successful flight over the sea was accomplished by Charles Kingsford Smith later that year. The first person to row solo across the sea was Colin Quincey in 1977. The next successful solo crossing was completed by his son, Shaun Quincey in 2010.
See also 
- Rāwiri Taonui. Tapa whenua – naming places – Events, maps and European influences, Te Ara – the Encyclopedia of New Zealand, Ministry for Culture and Heritage. ISBN 978-0-478-18451-8. Updated 1 March 2009. Retrieved 24 February 2011.
- "Limits of Oceans and Seas, 3rd edition". International Hydrographic Organization. 1953. Retrieved 7 February 2010.
- Anne Barrowclough (14 March 2010). "Kiwi becomes second person to row across the Tasman Sea". Times Online (Times Newspapers). Retrieved 22 May 2011.
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