|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)|
|Surface area||2,300,000 km2 (890,000 sq mi)|
|Islands||Lord Howe Island, Norfolk Island|
|Benches||Lord Howe Rise|
|Settlements||Newcastle, Sydney, Wollongong, Auckland, Wellington, Hobart, New Plymouth, Whanganui|
The Tasman Sea (Māori: Te Tai-o-Rehua, : Tasman Sii) is a marginal sea of the South Pacific Ocean, situated between Australia and New Zealand. It measures about 2,000 km (1,200 mi) across and about 2,800 km (1,700 mi) from north to south. The sea was named after the Dutch explorer Abel Janszoon Tasman, who in 1642 was the first recorded European to encounter New Zealand and Tasmania. British explorer Lieutenant James Cook later extensively navigated the Tasman Sea in the 1770s as part of his first voyage of exploration.Pitcairn-Norfolk
The Tasman Sea is informally referred to in both Australian and New Zealand English as the Ditch; for example, crossing the Ditch means travelling to Australia from New Zealand, or vice versa. The diminutive term "the Ditch" used for the Tasman Sea is comparable to referring to the North Atlantic Ocean as "the Pond".
The south of the sea is passed over by depressions going from west to east. The northern limit of these westerly winds is near to 40°S. During the southern winter, from April to October, the northern branch of these winds from the west changes its direction toward the north and goes up against trade winds. Hence, the sea receives frequent winds from the southwest during this period. In the Australian summer (from November to March), the southern branch of the trade winds goes up against west winds and produces further wind activity in the area.
The Tasman Sea is 2,250 km (1,400 mi) wide and has an area of 2,300,000 km2 (890,000 sq mi). The depth of the sea is 5,493 m (18,022 ft). The base of the sea is made up of globigerina ooze. A small zone of pteropod ooze is found to the south of New Caledonia and to the southern extent of 30°S, siliceous ooze can be found.
The International Hydrographic Organization defines the limits of the Tasman Sea as:
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 Northeast From the South East Rock to the north point of Three Kings Islands (), thence to North Cape in New Zealand.
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).
On the Southeast A line running from South West Cape, Stewart Island, through the Snares (48°S, 166°30'E) to North West Cape, Auckland Island (), through this island to its southern point.
On the South A line joining the southern point of Auckland Island () to South East Cape, the southern point of Tasmania.
The Tasman Sea's midocean 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 midsea island groups, quite apart from coastal islands located near the Australian and New Zealand mainlands:
A deep-sea research ship, the RV Tangaroa, explored the sea and found 500 species of fish and 1300 species of invertebrates. The tooth of a megalodon, an extinct shark, was also found by researchers.
Moncrieff and Hood were the first to attempt 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.
Abel Janszoon Tasman was a Dutch seafarer, explorer, and merchant, best known for his voyages of 1642 and 1644 in the service of the Dutch East India Company (VOC). He was the first known European explorer to reach New Zealand and the islands of Fiji and Van Diemen's Land.
Bass Strait is a sea strait separating Tasmania from the Australian mainland, specifically the state of Victoria. Formed 8,000 years ago by rising sea levels, the Bass Strait was named after explorer and physician George Bass.
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The Arafura Sea lies west of the Pacific Ocean, overlying the continental shelf between Australia and Western New Guinea, which is the Indonesian part of the Island of New Guinea.
The Maatsuyker Islands are a group of islands and rocks located 5.5 kilometres (3.4 mi) off the south coast of Tasmania, Australia. Maatsuyker Island is the southernmost island of the group and of the Australian continental shelf. There are exposed rocks further south of Maatsuyker but they do not meet the definition of "islands". Macquarie Island, far to the south, is also Australian territory but it is an upthrust piece of ocean floor in the remote Southern Ocean and is in a geological sense completely separate from the continent.
The Lord Howe Rise is a deep sea plateau which extends from south west of New Caledonia to the Challenger Plateau, west of New Zealand in the south west of the Pacific Ocean. To its west is the Tasman Basin and to the east is the New Caledonia Basin. Lord Howe Rise has a total area of about 1,500,000 square km, and generally lies about 750 to 1,200 metres under water. It is part of Zealandia, a much larger continent that is now mostly submerged, and so is composed of continental crust.
Eddystone is a tower-shaped rock or small island, located in the Southern Ocean, off the southern coast of Tasmania, Australia. The island is situated approximately 27 kilometres (17 mi) from the South East Cape on a bearing of 149° and is contained within the Southwest National Park, part of the Tasmanian Wilderness World Heritage Site. An erosional remnant of the Tasmanian mainland with an elevation of 30 metres (98 ft) above sea level, the island is estimated to have separated from the Tasmanian mainland at least 15,000 years ago.
This outline of Australia is an overview of and topical guide to various aspects of the country of Australia.
Zealandia, also known as Te Riu-a-Māui (Māori) or Tasmantis, is an almost entirely submerged mass of continental crust that subsided after breaking away from Gondwanaland 83–79 million years ago. It has been described variously as a submerged continent, a continental fragment, a microcontinent, and a continent. The name and concept for Zealandia was proposed by Bruce Luyendyk in 1995, and satellite imagery shows it to be almost the size of Australia.
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The geology of New Zealand is noted for its volcanic activity, earthquakes and geothermal areas because of its position on the boundary of the Australian Plate and Pacific Plates. New Zealand is part of Zealandia, a microcontinent nearly half the size of Australia that broke away from the Gondwanan supercontinent about 83 million years ago. New Zealand's early separation from other landmasses and subsequent evolution have created a unique fossil record and modern ecology.
The East Tasman Plateau is a submerged microcontinent south east of Tasmania. Its area is 50,000 square kilometres (19,000 sq mi), and it is mostly from 2,500 to 3,000 metres deep. It is a circular piece of continental rocks surrounded by oceanic crust. Volcanism occurred there. The East Tasman Plateau is separated from the island of Tasmania by 100 kilometres (62 mi) of deeper water, and the East Tasman Saddle is a higher ridge connecting the plateau to the Freycinet Peninsula region of the Tasmanian East Coast. This ridge runs north west from the plateau. South-west of the plateau is the L'Atalante Depression.
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The Tasman Front is a relatively warm water east-flowing surface current and thermal boundary that separates the Coral Sea to the north and the Tasman Sea to the south. The name was proposed by Denham and Crook in 1976, to describe a thermal front that extends from Australia and New Zealand between the Coral Sea and Tasman Sea. Originating in the edge of the East Australian Current (EAC), the Tasman Front meanders eastward between longitudes 152° E and 164° E and latitudes 31° S and 37° S, then reattaches to the coastline at New Zealand, forming the East Auckland Current.