An orthographic projection of geopolitical Oceania
Oceania (UK: , US: ( listen), ) is a geographic region comprising Melanesia, Micronesia, Polynesia and Australasia. Spanning the eastern and western hemispheres, Oceania covers an area of 8,525,989 square kilometres (3,291,903 sq mi) and has a population of 40 million. Situated in the southeast of the Asia-Pacific region, Oceania is the smallest continental grouping in land area and the second smallest in population after Antarctica.
The islands at the geographic extremes of Oceania are Bonin Islands, a politically integral part of Japan; Hawaii, a state of the United States; Clipperton Island, a possession of France; the Juan Fernández Islands, belonging to Chile; the Campbell Islands, belonging to New Zealand; and the Cocos (Keeling) Islands, belonging to Australia. Oceania has a diverse mix of economies from the highly developed and globally competitive financial market of Australia and New Zealand, which rank high in quality of life and human development index, to the much less developed economies that belong to countries such as of Kiribati and Tuvalu, while also including medium-sized economies of Pacific islands such as Palau, Fiji and Tonga. The largest and most populous country in Oceania is Australia, with Sydney being the largest city of both Oceania and Australia.
The Pitcairn Islands
: Pitkern Ailen
) are a group of four islands, of which only Pitcairn Island
— the second largest — is inhabited, in the southern Pacific Ocean
, the only remaining British
colony in the Pacific. The islands are best known for being the home of the descendants of the Bounty mutineers
and the Tahitians
who accompanied them.
With only about fifty inhabitants (from nine families), Pitcairn is also famed for being the least populated country in the world (although it is not a sovereign nation). The capital is Adamstown, Pitcairn Islands.
Lōʻihi Seamount is an active undersea volcano located around 35 km (22 mi) off the southeast coast of the island of Hawaiʻi about 975 m (3,000 ft) below sea level. It lies on the flank of Mauna Loa, the largest shield volcano on Earth. Lōʻihi means "long" in Hawaiian.
Lōʻihi Seamount is the newest volcano in the Hawaiian-Emperor seamount chain, a string of volcanoes that stretches over 5,800 km (3,600 mi) northwest of Lōʻihi and the island of Hawaiʻi. Unlike most active volcanoes in the Pacific Ocean that make up the active plate margins on the Pacific Ring of Fire, Lōʻihi and the other volcanoes of the Hawaiian-Emperor seamount chain are hotspot volcanoes and formed well away from the nearest plate boundary. Volcanoes in the Hawaiian Islands arise from the Hawaiʻi hotspot, and as the youngest volcano in the chain, Lōʻihi is the only Hawaiian volcano in the deep submarine preshield stage of development.
Lōʻihi began forming around 400,000 years ago and is expected to begin emerging above sea level about 10,000–100,000 years from now. At its summit, Lōʻihi Seamount stands more than 3,000 m (10,000 ft) above the seafloor, making it taller than Mount St. Helens was before its catastrophic 1980 eruption. The summit is currently 975 m (3,000 ft) below sea level. A diverse microbial community resides around Lōʻihi's many hydrothermal vents.
In other languages
Wikipedia in other languages used in Oceania:
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