Pacific Islands leaders, all members of the Pacific Islands Forum, at a meeting in Samoa with former US Secretary of State Condoleezza Rice (center), 26 July, 2008

The Pacific Islands comprise 20,000 to 30,000 islands in the Pacific Ocean. The islands are also sometimes collectively called Oceania,^[1] although Oceania is sometimes defined as also including Australasia and the Malay Archipelago.

Three of the major groups of islands in the Pacific Ocean.

The Pacific Islands lying south of the tropic of Cancer are traditionally grouped into the three divisions of Melanesia, Micronesia, and Polynesia:

• Melanesia means black islands. These include New Guinea (the largest Pacific island, which is divided into the sovereign nation of Papua New Guinea and the Indonesian provinces of Maluku, Papua and West Papua), New Caledonia, Zenadh Kes (Torres Strait Islands), Vanuatu, Fiji, and the Solomon Islands.
• Micronesia means small islands. These include the Marianas, Guam, Wake Island, Palau, the Marshall Islands, Kiribati, *Nauru, and the Federated States of Micronesia. Most of these lie north of the equator.
• Polynesia means many islands. These include New Zealand, the Hawaiian Islands, Rotuma, the Midway Islands, Samoa, American Samoa, Tonga, Tuvalu, the Cook Islands, Wallis and Futuna, Tokelau, Niue, French Polynesia, and Easter Island. It is the largest of the three zones.

The region's islands are classified into two groups, high islands and low islands. Volcanoes form high islands, which generally can support more people and have a more fertile soil. Low islands are reefs or atolls, and are relatively small and infertile. Melanesia, the most populous of the three regions, contains mainly high islands, while most of Micronesia and Polynesia are low islands. In addition, there are many other islands located within the boundaries of the Pacific Ocean that are not considered part of Oceania. These islands include the Galápagos Islands of Ecuador; the Aleutian Islands in Alaska, United States; the Russian islands of Sakhalin and Kuril Islands; Taiwan and other islands of the Republic of China; the Philippines; islands in the South China Sea, which includes the disputed South China Sea Islands; most of the islands of Indonesia; and the island nation of Japan, which comprises the Japanese Archipelago.

• Nauru (along with Kiribati's Banaba island) could be counted as somewhat of an exception. The indigenous Nauruans are both a mosaic and mixture of groups from all three categories- with cultural influence stemming primarily from Micronesia. The island was also said to be an extreme point of the "Tongan Empire" and may as a result share subtle cultural and, obviously, historical aspects with Polynesia. Lastly, the people speak a language and have a number of genes not in common with any of the three regions. Of the three, Nauru is least like Polynesia and Melanesia and for practical applications, Nauru is either assigned to Micronesia or designated as a separate entity (with the former being the most common).

List of islands[link]

This is a list of many of the major Pacific islands, organized by archipelago or political unit. In order to keep this list of moderate size, links are given to more complete lists for countries with large numbers of small or uninhabited islands.

Note: many Polynesian languages have a glottal stop, which in most of them is seldom written, however. If a name with a < Ê» > cannot be found, try to rewrite it without it. See 'okina for more info.

• American Samoa (eastern part of the Samoa Islands, United States territory)
  • AunuÊ»u
  • Ofu
  • Olosega
  • Rose Atoll
  • Swains Island (Olosenga, Olohega) (disputed)
  • TaÊ»u
  • Tutuila

• Baker Island (United States)

• British Columbia, Canada (many islands). All of Canada's Pacific islands are located in the province of British Columbia. Vancouver Island is Canada's largest Pacific island.

• Caroline Islands (Federated States of Micronesia; Palau)
  • Federated States of Micronesia
    • Pohnpei
    • Yap
      • Ulithi
    • Chuuk
      • Puluwat
    • Kosrae
  • Palau
    • Babeldaob
    • Ioueldaob
      • Koror
    • Southwest Islands

• Clipperton Island (France)

• Cook Islands
  • Aitutaki
  • Atiu
  • Pamati (Palmerston)
  • Mangaia
  • Manihiki (Humphrey)
  • Manuae (Hervey)
  • Mauke (Parry)
  • Mitiaro
  • Nassau
  • Pukapuka (Danger)
  • Rakahanga (Reirson)
  • Rarotonga
  • Suwarrow (Anchorage)
  • Takutea
  • Tongareva (Penrhyn)

• Desventuradas Islands (Chile)

• Easter Island/Rapa Nui (Chile)

• Fiji Islands
  • Principal islands:
    • Viti Levu
    • Vanua Levu
  • Significant outliers:
    • Conway Reef
    • Kadavu Island
    • Taveuni
    • Rotuma Island
  • Archipelagos:
    • Kadavu Group
    • Lau Islands
    • Lomaiviti Islands
    • Mamanuca Islands
    • Moala Islands
    • Ringgold Isles
    • Rotuma Group
    • Vanua Levu Group
    • Viti Levu Group
    • Yasawa Islands

• French Polynesia ("Tahiti", Autonomous Overseas Territory of France)
  • Austral Islands
    • Tubuai
  • Society Islands
    • Iles du Vent (Windward Islands)
      • Moorea
      • Tahiti
      • Tetiaroa
      • Maiao
      • Mehetia
    • Iles Sous le Vent (Leeward Islands)
      • Bora Bora
      • Huahine
      • Maupiti
      • Raiatea & Tahaa
      • Tupai
      • Mopelia (aka Maupihaa)
      • Manuae (aka Scilly Atoll)
      • Motu One (aka Bellinghausen)
  • Marquesas
    • Fatu Hiva
    • Hiva Oa
    • Nuku Hiva
    • Tahuata
    • Ua Huka
    • Ua Pou
  • Tuamotus
    • Rangiroa
    • Fakarava
    • Moruroa
    • Fangataufa
  • Gambier Islands
    • Mangareva
    • Helena Island
• Galapagos Islands (Ecuador)
• Gilbert Islands (Kiribati)

• Hawaii (United States; see also Hawaiian Islands)
  • Main islands
    • HawaiÊ»i
    • KahoÊ»olawe
    • KauaÊ»i
    • LanaÊ»i
    • Maui
    • MolokaÊ»i
    • NiÊ»ihau
    • OÊ»ahu
  • Northwestern Hawaiian Islands
    • KaÊ»ula
    • Nihoa
    • Necker
    • French Frigate Shoals
    • Gardner Pinnacles
    • Maro Reef
    • Laysan
    • Lisianski
    • Pearl and Hermes Reef
    • Midway
    • Kure

• Howland Island (United States)

• Indonesia
• Maluku
• Papua

• Japan an archipelago of 6,852 islands

• Johnston Atoll (United States)

• Juan Fernández Islands (Chile)

• Kermadec Islands (New Zealand)
  • Macauley Island
  • Raoul Island

• Line Islands
  • Caroline Island
  • Flint Island (Kiribati)
  • Jarvis Island (United States)
  • Kingman Reef (United States)
  • Kiritimati/Christmas Island (Kiribati)
  • Malden Island (Kiribati)
  • Palmyra Atoll (United States)
  • Starbuck Island (Kiribati)
  • Tabuaeran/Fanning Island (Kiribati)
  • Teraina/Washington Island (Kiribati)
  • Tongareva/Penhryn Island (Cook Islands)
  • Vostok Island (Kiribati)

• Lord Howe Island (Australia)

• Marcus Island (Japan)

• Marianas Islands (United States)
  • Guam
  • Northern Marianas Islands
    • Saipan
    • Rota
    • Tinian
    • Maug
    • Pagan Island
    • Alamagan
    • Farallon de Pajaros

• Marshall Islands
  • Bikini
  • Enewetak
  • Kwajalein
  • Rongelap
  • Majuro

• Norfolk Island (Australia)

• Federated States of Micronesia (Caroline Islands)
  • Chuuk (Truk)
    • Puluwat
  • Pohnpei
  • Kosrae
  • Yap
    • Ulithi

• Nauru

• New Caledonia ("Kanaky", France)
  • Chesterfield Islands
  • Ilots du Mouillage
  • New Caledonia
    • Isle of Pines
    • Belep Islands
    • New Caledonia
  • Loyalty Islands
    • Bagao
    • Lifou Island
    • Maré Island
    • Ouvéa Island
    • Tiga Island

• New Zealand ("Aotearoa", see also Islands of New Zealand)
  • Chatham Islands
    • Chatham Island
    • Pitt Island
  • D'Urville Island
  • Great Barrier Island
  • Kapiti Island
  • North Island
  • South Island
  • Stewart Island/Rakiura
  • Waiheke Island

• Niue (Savage Island)

• Okinotori Islands (Japan)

• Papua New Guinea
  • Bismarck Archipelago
    • Admiralty Islands
    • New Britain
    • New Ireland
    • Saint Matthias Group
  • Bougainville
  • D'Entrecasteaux Islands
  • Louisiade Archipelago
  • Trobriand Islands

• Phoenix Islands (Kiribati)

• Pitcairn Islands (UK)
  • Henderson Island
  • Oeno Island
  • Ducie Island

• Revillagigedo Islands (Mexico)

• Sakhalin (Russia)

• Samoa (western part of the Samoa Islands)
  • SavaiÊ»i
  • Ê»Upolu
  • Apolima
  • Manono
  • Nuutele

• Solomon Islands (see also Islands of the Solomon Islands)
  • Bellona
  • Choiseul
  • Florida Island
  • Guadalcanal
  • Malaita
  • Maramasike
  • New Georgia Islands
  • Rennell
  • Russell Islands
  • San Cristobal
  • Santa Cruz Islands
  • Santa Isabel
  • Shortland Islands
  • Sikaiana (Stewart Islands)
  • Tulagi
  • Ulawa
  • Uki

• Tokelau
  • Atafu (Duke of York Island)
  • Fakaofo (Bowditch Island)
  • Nukunonu (Duke of Clarence Island)
  • Olohega (Swains island) (disputed)

• Tonga (only main islands or groups, on north-south order. See also complete list of islands in Tonga)
  • NiuafoÊ»ou
  • Niuatoputapu (Keppel's Island)
  • VavaÊ»u
  • Kao
  • Tofua
  • HaÊ»apai
  • Tongatapu
  • Ê»Eua

• Torres Strait Islands (Australia)

• Tuvalu (see also Islands of Tuvalu)
  • Funafuti (atoll of at least 30 islands)
  • Nanumanga (or Nanumaga)
  • Nanumea (atoll of at least 6 islands)
  • Niulakita
  • Niutao
  • Nui (atoll of at least 21 islands)
  • Nukufetau (atoll of at least 33 islands)
  • Nukulaelae (atoll of at least 15 islands)
  • Vaitupu (atoll of at least 9 islands)

• Vanuatu (New Hebrides; see also Islands of Vanuatu)
  • Ambrym
  • Anatom
  • Aoba
  • Éfaté
  • Erromango
  • Espiritu Santo
  • Futuna
  • Hunter (claimed by France and Vanuatu)
  • ÃŽles Banks
  • ÃŽles Torres
  • Maéwo
  • Matthew (claimed by France and Vanuatu)
  • Malakula
  • Pentecóte
  • Tanna

• Wake Island (United States)

• Wallis and Futuna (France)
  • Alofi
  • Futuna
  • Wallis (Ê»Uvea)

• Willis Island (Australia)

See also[link]

• List of islands (islands around the world)

Pacific islands by continent[link]

Antarctica[link]

• List of islands of Antarctica and the Southern Ocean

Asia[link]

• List of islands of Asia

Central America[link]

• List of islands of Central America

North America[link]

• List of islands of North America
• List of islands of Canada, section British Columbia
• List of islands of Mexico
• List of islands of the United States

Oceania[link]

• List of islands of Australia
• List of islands of Kiribati
• List of islands of the Marshall Islands
• List of islands of New Zealand
• List of islands of the Solomon Islands
• List of islands in Tonga
• List of islands of Tuvalu
• List of islands of Vanuatu

European islands in Oceania[link]

• List of islands administered by France in the Indian and Pacific oceans#Pacific Islands
• Pitcairn Islands#Geography

U.S. islands in Oceania[link]

• List of islands of Hawaii
• List of islands of the United States#Insular areas

South America[link]

• List of islands of South America
• List of islands of Chile
• List of islands of Colombia
• List of islands of Ecuador
• List of islands of Peru

Islands of adjacent oceans[link]

• List of Antarctic and sub-Antarctic islands
• List of islands in the Arctic Ocean
• List of islands in the Atlantic Ocean
• List of islands in the Indian Ocean

Footnotes[link]

References[link]

• William Collins Sons & Co Ltd (1983), Collins Atlas of the World (revised 1995 ed.), London W6 8JB: HarperCollins, ISBN 0-00-448227-1 

v t e Countries and territories of Oceania Sovereign states Australia Chile Easter Island Juan Fernández Islands East Timor (Timor-Leste) Fiji Indonesia Kiribati Marshall Islands Federated States of Micronesia Japan Bonin Islands Nauru New Zealand Cook Islands Niue Palau Papua New Guinea Samoa Solomon Islands Tonga Tuvalu United States Hawaii Palmyra Atoll Vanuatu Dependencies and other territories Australia Ashmore and Cartier Islands Christmas Island Cocos (Keeling) Islands Coral Sea Islands Territory Norfolk Island France Clipperton Island French Polynesia New Caledonia Wallis and Futuna New Zealand Cook Islands Niue Tokelau United Kingdom Pitcairn Islands United States American Samoa Baker Island Guam Howland Island Jarvis Island Johnston Atoll Kingman Reef Midway Atoll Northern Mariana Islands Wake Island

The Pacific Ocean

Earth's oceans (World Ocean)
Arctic Ocean Atlantic Ocean Indian Ocean Pacific Ocean Southern Ocean

This video was taken by the crew of Expedition 29 on board the ISS on a pass from the Middle East to the South Pacific Ocean.

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, bounded by Asia and Australia in the west, and the Americas in the east.

At 165.2 million square kilometres (64.1 million square miles) in area, this largest division of the World Ocean â€“ and, in turn, the hydrosphere â€“ covers about 46% of the Earth's water surface and about one-third of its total surface area, making it larger than all of the Earth's land area combined.^[1] The equator subdivides it into the North Pacific Ocean and South Pacific Ocean, with two exceptions: the Galápagos and Gilbert Islands, while straddling the equator, are deemed wholly within the South Pacific.^[2] The Mariana Trench in the western North Pacific is the deepest point in the world, reaching a depth of 10,911 metres (35,797 ft).^[3]

The eastern Pacific Ocean was first sighted by Europeans early in the 16th century. Spanish explorer Vasco Núñez de Balboa crossed the Isthmus of Panama in 1513 and named it Mar del Sur (South Sea). The ocean's current name was given by Portuguese explorer Ferdinand Magellan during the Spanish expedition of world circumnavigation in 1521, who encountered favourable winds as he reached the ocean and called it Mar Pacifico in Portuguese, meaning "peaceful sea".^[4]

Overview[link]

Sunset over the Pacific Ocean as seen from the International Space Station. Anvil tops of thunderclouds are also visible.

The Pacific Ocean encompasses approximately one-third of the Earth's surface, having an area of 165.2 million square kilometres (64.1 million square miles) â€”significantly larger than Earth's entire landmass, with room for another Africa to spare.

Extending approximately 15,500 kilometres (9,600 mi) from the Bering Sea in the Arctic to the northern extent of the circumpolar Southern Ocean at 60°S (older definitions extend it to Antarctica's Ross Sea), the Pacific reaches its greatest east-west width at about 5°N latitude, where it stretches approximately 19,800 kilometres (12,300 mi) from Indonesia to the coast of Colombia – halfway across the world, and more than five times the diameter of the Moon. The lowest known point on Earth—the Mariana Trench—lies 10,911 metres (35,797 ft or 5,966 fathoms) below sea level. Its average depth is 4,028~4,188 metres (14,000 ft or 2,333 fathoms).^[1]

The Pacific Ocean is currently shrinking due to plate tectonics, while the Atlantic Ocean is increasing in size, by roughly an inch per year (2–3 cm/yr) on 3 sides, roughly averaging 0.2 square miles (0.52 km²) a year.

Storm in Pacifica, California

Along the Pacific Ocean's irregular western margins lie many seas, the largest of which are the Celebes Sea, Coral Sea, East China Sea, Philippine Sea, Sea of Japan, South China Sea, Sulu Sea, Tasman Sea, and Yellow Sea. The Strait of Malacca joins the Pacific and the Indian Oceans on the west, and Drake Passage and the Straits of Magellan link the Pacific with the Atlantic Ocean on the east. To the north, the Bering Strait connects the Pacific with the Arctic Ocean.

As the Pacific straddles the 180th meridian, the West Pacific (or western Pacific, near Asia) is in the Eastern Hemisphere, while the East Pacific (or eastern Pacific, near the Americas) is in the Western Hemisphere.

For most of Magellan's voyage from the Strait of Magellan to the Philippines, the explorer indeed found the ocean peaceful. However, the Pacific is not always peaceful. Many tropical storms batter the islands of the Pacific. The lands around the Pacific Rim are full of volcanoes and often affected by earthquakes. Tsunamis, caused by underwater earthquakes, have devastated many islands and in some cases destroyed entire towns.

Extent[link]

Water characteristics[link]

Sunset in Monterey County, California, U.S.

The volume of the Pacific Ocean is approximately 622 million cubic km. Water temperatures in the Pacific vary from freezing in the poleward areas to about 30 °C (86 Â°F) near the equator. Salinity also varies latitudinally. The water near the equator is less salty than that found in the mid-latitudes because of abundant equatorial precipitation throughout the year. Poleward of the temperate latitudes salinity is also low, because little evaporation of seawater takes place in these frigid areas.

The motion of Pacific waters is generally clockwise in the Northern Hemisphere (the North Pacific gyre) and counter-clockwise in the Southern Hemisphere. The North Equatorial Current, driven westward along latitude 15°N by the trade winds, turns north near the Philippines to become the warm Japan or Kuroshio Current.

Turning eastward at about 45°N, the Kuroshio forks and some waters move northward as the Aleutian Current, while the rest turn southward to rejoin the North Equatorial Current. The Aleutian Current branches as it approaches North America and forms the base of a counter-clockwise circulation in the Bering Sea. Its southern arm becomes the chilled slow, south-flowing California Current.

The South Equatorial Current, flowing west along the equator, swings southward east of New Guinea, turns east at about 50°S, and joins the main westerly circulation of the Southern Pacific, which includes the Earth-circling Antarctic Circumpolar Current. As it approaches the Chilean coast, the South Equatorial Current divides; one branch flows around Cape Horn and the other turns north to form the Peru or Humboldt Current.

Geology[link]

The Pacific is ringed by many volcanoes and oceanic trenches

Ulawun stratovolcano situated on the island of New Britain, Papua New Guinea

The ocean was mapped by Abraham Ortelius; he called it Maris Pacifici because of Ferdinand Magellan, who sailed the Pacific during his circumnavigation from 1519 to 1522 and said that it was much more calm than the Atlantic.

The andesite line is the most significant regional distinction in the Pacific. It separates the deeper, mafic igneous rock of the Central Pacific Basin from the partially submerged continental areas of felsic igneous rock on its margins. The andesite line follows the western edge of the islands off California and passes south of the Aleutian arc, along the eastern edge of the Kamchatka Peninsula, the Kuril Islands, Japan, the Mariana Islands, the Solomon Islands, and New Zealand's North Island.

The dissimilarity continues northeastward along the western edge of the Andes Cordillera along South America to Mexico, returning then to the islands off California. Indonesia, the Philippines, Japan, New Guinea, and New Zealand lie outside the Andesite Line.

Within the closed loop of the Andesite Line are most of the deep troughs, submerged volcanic mountains, and oceanic volcanic islands that characterize the Pacific basin. Here basaltic lavas gently flow out of rifts to build huge dome-shaped volcanic mountains whose eroded summits form island arcs, chains, and clusters. Outside the Andesite Line, volcanism is of the explosive type, and the Pacific Ring of Fire is the world's foremost belt of explosive volcanism. The Ring of Fire is named after the several hundred active volcanoes that sit above the various subduction zones.

The Pacific Ocean is the only ocean which is almost totally bounded by subduction zones. Only the Antarctic and Australian coasts have no nearby subduction zones.

Geological history[link]

The Pacific Ocean developed from the Panthalassic Ocean following the breakup of Pangaea. There is no firm date for when the changeover occurred, as the replacement of the sea bed is a continuous process, though reconstruction maps often change the name from Panthalassic to Pacific around the time the Atlantic Ocean began to open.^[5][6][7] The Panthalassic Ocean first opened 750 million years ago at the breakup of Rodinia,^[7] but the oldest Pacific Ocean floor is only around 180 Ma old.^[8]

Seamount chains[link]

The Pacific Ocean contains several long seamount chains, formed by hotspot volcanism. These include the Hawaiian – Emperor seamount chain and the Louisville seamount chain.

Landmasses and islands[link]

Tahuna maru islet, French Polynesia.

The largest landmass entirely within the Pacific Ocean is the island of New Guinea— the second largest island in the world. Almost all of the smaller islands of the Pacific lie between 30°N and 30°S, extending from Southeast Asia to Easter Island; the rest of the Pacific Basin is almost entirely submerged. During the last glacial period, New Guinea was part of Australia so the largest landmass would have been Borneo–Palawan.

The great triangle of Polynesia, connecting Hawaii, Easter Island, and New Zealand, encompasses the island arcs and clusters of the Cook Islands, Marquesas Islands, Samoa, Society, Tokelau, Tonga, Tuamotu, Tuvalu and the Wallis and Futuna islands.

North of the equator and west of the International Date Line are the numerous small islands of Micronesia, including the Caroline Islands, the Marshall Islands and the Mariana Islands.

Big Sur Coast in Central California.

In the southwestern corner of the Pacific lie the islands of Melanesia, dominated by New Guinea. Other important island groups of Melanesia include the Bismarck Archipelago, Fiji, New Caledonia, the Solomon Islands and Vanuatu.

Islands in the Pacific Ocean are of four basic types: continental islands, high islands, coral reefs, and uplifted coral platforms. Continental islands lie outside the andesite line and include New Guinea, the islands of New Zealand, and the Philippines. Some of these islands are structurally associated with nearby continents. High islands are of volcanic origin, and many contain active volcanoes. Among these are Bougainville, Hawaii, and the Solomon Islands.

The third and fourth types of islands are both the result of coralline island building. Coral reefs are low-lying structures that have built up on basaltic lava flows under the ocean's surface. One of the most dramatic is the Great Barrier Reef off northeastern Australia. A second island type formed of coral is the uplifted coral platform, which is usually slightly larger than the low coral islands. Examples include Banaba (formerly Ocean Island) and Makatea in the Tuamotu group of French Polynesia.

History and economy[link]

Maris Pacifici by Ortelius (1589). One of the first printed maps to show the Pacific Ocean; see also Waldseemüller map (1507).^[9]

USS Lexington under air attack on 8 May 1942 during the Battle of the Coral Sea.

Important human migrations occurred in the Pacific in prehistoric times, most notably those of the Polynesians from the Asian edge of the ocean to Tahiti and then to Hawaii, New Zealand, and Easter Island.

The east side of the ocean was discovered by Spanish explorer Vasco Núñez de Balboa in the early 16th century. Balboa's expedition crossed the Isthmus of Panama and reached the Pacific Ocean in 1513. He named it Mar del Sur (South Sea). Later, Portuguese explorer Ferdinand Magellan sailed the Pacific on a Spanish expedition of world circumnavigation from 1519 to 1522. Magellan called the ocean Pacífico or "Pacific" because he encountered calm seas throughout his journey. Although Magellan himself died in the Philippines in 1521, Spanish navigator Juan Sebastian Elcano led the expedition back to Spain across the Indian Ocean and round the Cape of Good Hope, completing the first world circumnavigation in 1522.

In 1564, Spanish explorers crossed the ocean from Mexico led by Miguel López de Legazpi who sailed to the Philippines and Mariana Islands. For the remainder of the 16th century, Spanish influence was paramount, with ships sailing from Mexico and Peru across the Pacific Ocean to the Philippines, via Guam, and establishing the Spanish East Indies. The Manila Galleons operated for two and a half centuries linking Manila and Acapulco, in one of the longest trade routes in history. Spanish expeditions also discovered Tuvalu, the Marquesas, the Solomon Islands and New Guinea in the South Pacific.

Later, in the quest for Terra Australis, Spanish explorers in the 17th century also discovered the Pitcairn and Vanuatu archipelagos, and sailed the Torres Strait between Australia and New Guinea, named after navigator Luis Vaz de Torres. Dutch explorers, sailing around southern Africa, also engaged in discovery and trade; Abel Janszoon Tasman discovered Tasmania and New Zealand in 1642. The 18th century marked the beginning of major exploration by the Russians in Alaska and the Aleutian Islands. The Spanish also sent expeditions to the Pacific Northwest reaching Vancouver Island in southern Canada, and Alaska. The French explored and settled Polynesia, and the British made three voyages with James Cook to the South Pacific and Australia, Hawaii, and the North American Pacific Northwest. In 1768 Pierre-Antoine Véron, a young astronomer accompanying Louis Antoine de Bougainville on his voyage of exploration, established the width of the Pacific with precision for the first time in history.^[10] The Spanish organized one of the earliest voyages of scientific exploration with the Malaspina Expedition of 1789-1794 that sailed vast areas of the Pacific, from Cape Horn to Alaska, Guam and the Philippines, New Zealand, Australia and the South Pacific.

The Bathyscaphe Trieste, before her record dive to the bottom of the Mariana Trench, 23 January 1960.

Growing imperialism during the 19th century resulted in the occupation of much of Oceania by other European powers, and later, the United States and Japan. Significant contributions to oceanographic knowledge were made by the voyages of HMS Beagle in the 1830s, with Charles Darwin aboard; HMS Challenger during the 1870s; the USS Tuscarora (1873–76); and the German Gazelle (1874–76).

Although the United States gained control of Guam and the Philippines from Spain in 1898, Japan controlled most of the western Pacific by 1914 and occupied many other islands during World War II. However, by the end of that war, Japan was defeated and the U.S. Pacific Fleet was the virtual master of the ocean. Since the end of World War II, many former colonies in the Pacific have become independent states.

The exploitation of the Pacific's mineral wealth is hampered by the ocean's great depths. In shallow waters of the continental shelves off the coasts of Australia and New Zealand, petroleum and natural gas are extracted, and pearls are harvested along the coasts of Australia, Japan, Papua New Guinea, Nicaragua, Panama, and the Philippines, although in sharply declining volume in some cases.

Fish are an important economic asset in the Pacific. The shoreline waters of the continents and the more temperate islands yield herring, salmon, sardines, snapper, swordfish, and tuna, as well as shellfish.

Environmental issues[link]

Marine debris on a Hawaiian coast

The quantity of small plastic fragments floating in the north-east Pacific Ocean has increased a hundred fold over the past 40 years (2012).^[11]

Marine pollution is a generic term for the harmful entry into the ocean of chemicals or particles. The biggest culprits are people who use the rivers for disposing of their waste.^[12] The rivers then empty into the Ocean, and with it the many chemicals used as fertilizers in agriculture. The excess of oxygen depleting chemicals in the water leads to hypoxia and the creation of a dead zone.^[13]

Marine debris, also known as marine litter, is a term used to describe human-created waste that has ended up floating in a lake, sea, ocean or waterway. Oceanic debris tends to accumulate at the centre of gyres and coastlines, frequently washing aground where it is known as beach litter.^[12]

In addition, the Pacific Ocean served as the crash site of satellites, including Mars 96, Fobos-Grunt and Upper Atmospheric Research Satellite.

Bordering countries and territories[link]

Sovereign nations[link]

¹ The status of the PRC vs. the ROC is disputed. For more information, see status of Taiwan.

Territories[link]

Major ports and harbors[link]

See also[link]

	Environment portal
	Ecology portal
	Geography portal
	Weather portal

References[link]

Further reading[link]

Based on public domain text from US Naval Oceanographer

External links[link]

Look up pacific ocean in Wiktionary, the free dictionary.

Wikimedia Commons has media related to: Pacific Ocean

• EPIC Pacific Ocean Data Collection Viewable on-line collection of observational data
• NOAA In-situ Ocean Data Viewer plot and download ocean observations
• NOAA PMEL Argo profiling floats Realtime Pacific Ocean data
• NOAA TAO El Niño data Realtime Pacific Ocean El Niño buoy data
• NOAA Ocean Surface Current Analyses – Realtime (OSCAR) Near-realtime Pacific Ocean Surface Currents derived from satellite altimeter and scatterometer data

Coordinates: 0°N 160°W / 0°N 160°W / 0; -160