Portal:Oceania

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The Oceania Portal

An orthographic projection of geopolitical Oceania

Oceania (UK: /ˌsiˈɑːniə, ˌʃi-, -ˈn-/, US: /ˌʃiˈæniə/ (About this soundlisten), /-ˈɑːn-/) is a geographic region that includes Australasia, Melanesia, Micronesia and Polynesia. Spanning the eastern and western hemispheres, Oceania has a land area of 8,525,989 square kilometres (3,291,903 sq mi) and a population of over 41 million. When compared to continents, the region of Oceania is the smallest in land area and the second smallest in population after Antarctica.

Oceania has a diverse mix of economies from the highly developed and globally competitive financial markets 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 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.

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Cook Bay on Moorea.

French Polynesia (French: Polynésie française, Tahitian: Porinetia Farani) is a French "overseas collectivity" (French: collectivité d'outre-mer, or COM) in the southern Pacific Ocean. It is made up of several groups of Polynesian islands, the most famous island being Tahiti in the Society Islands group, which is also the most populous island, and the seat of the capital of the territory (Papeete). The population is 245,405 (2002).

French Polynesia has a moderately developed economy, which is dependent on imported goods, tourism, and the financial assistance of mainland France. Tourist facilities are well developed on the major islands.

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3-D image of Loihi seamount after the collapse of the peak.

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.

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