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Zealandia is more than twice the size of the largest intraoceanic large igneous province (LIP) in the world, the Ontong Java Plateau (approximately 1,900,000 km 2 (730,000 sq mi)), and the world's largest island, Greenland (2,166,086 km 2 (836,330 sq mi)). Its area is six times the area of Madagascar, the next-largest microcontinent in the world, and more than half the area of the Australian continent. If classified as a microcontinent, Zealandia would be the world's largest microcontinent. With a total area of approximately 4,900,000 km 2 (1,900,000 sq mi), Zealandia is substantially larger than any features termed microcontinents and continental fragments. New Zealand is the largest part of Zealandia that is above sea level, followed by New Caledonia. Today, most of the landmass (94%) remains submerged beneath the Pacific Ocean. īy approximately 23 million years ago the landmass may have been completely submerged. A 2021 study suggests Zealandia is 1 billion years old, about twice as old as geologists previously thought. 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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It has been described variously as a submerged continent, a continental fragment, a microcontinent, and a continent. Zealandia (pronounced / z iː ˈ l æ n d i ə/), 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. Topography of Zealandia - The linear ridges running north-northeast ( Colville to the west and Kermadec to the east, separated by the Havre Trough and Lau Basin) and southwest (the Resolution Ridge System) away from New Zealand are not considered part of the continental fragment, nor are Australia (upper left), Vanuatu, or Fiji (top centre)