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| Geography of the Pacific Ocean | |
|---|---|
| Name | Pacific Ocean |
| Area | 178,706,000 km2 |
| Max depth | 10,984 m (Challenger Deep) |
| Basin countries | United States; Japan; Australia; Chile; Canada; Indonesia; Philippines; Russia; China; New Zealand; Mexico; Peru; Papua New Guinea; Fiji; Samoa; Tonga; Solomon Islands; Kiribati; Tuvalu; Palau; Nauru; Vanuatu; Costa Rica; Ecuador; Colombia; Panama; Guatemala; Honduras; El Salvador; Nicaragua; Brunei; Malaysia; Singapore; Thailand; Vietnam; North Korea; South Korea; Taiwan; Hong Kong; Macau; Philippines; Cambodia; Bolivia; Argentina |
Geography of the Pacific Ocean The Pacific Ocean is the world's largest oceanic division, spanning from the Arctic Chukchi Sea and Bering Sea in the north to the Southern Southern Ocean and from the coasts of Asia and Australia to the Americas. It contains the deepest points of the Earth such as the Challenger Deep in the Mariana Trench and hosts extensive archipelagos including Hawaii, Philippines, and New Zealand. The Pacific shapes continental margins like the Ring of Fire and influences climatic phenomena such as El Niño–Southern Oscillation.
The Pacific covers roughly one-third of the Earth's surface and is bounded by major landmasses including Eurasia (via Russia, Japan, China, Philippines), Oceania (including Australia, New Zealand, Melanesia, Micronesia, Polynesia), and the Americas (from Alaska and Canada through United States to Chile and Peru). Principal marginal seas include the Sea of Okhotsk, East China Sea, South China Sea, Coral Sea, Tasman Sea, Philippine Sea, Celebes Sea, and Sulu Sea. Major ports and coastal cities on its rim include San Francisco, Los Angeles, Seattle, Vancouver, Guatemala City, Lima, Santiago, Panama City, Guam, Tokyo, Osaka, Seoul, Shanghai, Manila, Jakarta, Sydney, and Auckland.
The basin contains vast features: the Aleutian Islands arc, the Hawaiian–Emperor seamount chain, the East Pacific Rise, the Nazca Plate and Cocos Plate margins, and back-arc basins like the Mariana Trough. Deep trenches include the Mariana Trench, Kermadec Trench, Tonga Trench, Peru–Chile Trench, and Japan Trench. Shallow continental shelves occur along the Sunda Shelf near Indonesia, the South China Sea platform, and the Bering Shelf. Large island groups and microcontinents such as New Guinea, Borneo, Tasmania, Java, Sulawesi, Honshu, and Kyushu break the ocean into characteristic basins like the North Pacific Basin and South Pacific Basin.
Surface currents include the North Pacific Gyre, South Pacific Gyre, Kuroshio Current, California Current, Peru (Humboldt) Current, East Australian Current, and the Equatorial Counter Current. Thermohaline circulation links the Pacific to the Atlantic Ocean and Indian Ocean via the Indonesian Throughflow, affecting global phenomena such as El Niño–Southern Oscillation, La Niña, and the Pacific Decadal Oscillation. Climate zones range from polar waters near Bering Strait and Aleutian Islands to tropical waters within the Coral Triangle, shaping weather systems like typhoons affecting Philippines, Japan, Taiwan, China, Hawaii and cyclones impacting Fiji, Vanuatu, and Samoa.
The Pacific hosts major archipelagos: the Philippine Archipelago, Malay Archipelago (including Indonesia), the Solomon Islands, Vanuatu, the Fiji Islands, Samoa, Tonga, the Cook Islands, French Polynesia (including Tahiti), Kiribati, Marshall Islands, Micronesia (country), Palau, Nauru, Tuvalu, Wallis and Futuna, and New Caledonia. Volcanic island chains include the Aleutians, Kuril Islands, Mariana Islands, and Hawaiian Islands. Continental islands include New Guinea, New Zealand North Island, New Zealand South Island, Borneo, Sumatra, and Sulawesi. Atolls such as Bikini Atoll and Midway Atoll are significant for ecological, historical, and geopolitical reasons.
The Pacific Plate interacts with surrounding plates—North American Plate, Cocos Plate, Nazca Plate, Philippine Sea Plate, Eurasian Plate, and Australian Plate—forming subduction zones, trenches, and volcanic arcs characteristic of the Ring of Fire. Hotspot volcanism produced the Hawaiian Islands and the Emperor Seamounts, while seafloor spreading at ridges like the East Pacific Rise generates new oceanic crust. Major earthquakes such as the 1960 Valdivia earthquake, 2011 Tōhoku earthquake and tsunami, and 1964 Alaska earthquake illustrate tectonic hazard distribution. Submarine features include abyssal plains, seamounts like Mauna Kea (submerged flank), and large igneous provinces such as the Ontong Java Plateau.
The Pacific encompasses rich marine ecoregions: the Coral Triangle with exceptional coral reef diversity around Indonesia, Philippines, Papua New Guinea, Malaysia, Solomon Islands, and Timor-Leste; kelp forests off California and British Columbia; and deep-sea habitats in trenches like the Mariana Trench and Japan Trench. Key species and habitats include blue whale feeding grounds near California Current, humpback whale migration routes to Hawaii and French Polynesia, tuna stocks in the Western and Central Pacific Fisheries Commission area, seabird colonies on Galápagos Islands and Kermadec Islands, and mangrove forests in Southeast Asia. Human impacts—overfishing exemplified by disputes involving Japan and South Korea, coral bleaching driven by global warming and El Niño–Southern Oscillation, plastic pollution found in the Great Pacific Garbage Patch, and invasive species introduced via ballast water—affect biodiversity across exclusive economic zones of United States, Australia, New Zealand, Chile, and island nations.
Sovereignty, commerce, and resource claims are mediated through frameworks involving United Nations Convention on the Law of the Sea, exclusive economic zones of United States, Russia, Japan, China, Australia, and Chile, and regional organizations like Pacific Islands Forum and Asia-Pacific Economic Cooperation. Major maritime routes connect ports such as Los Angeles, Long Beach, Shanghai, Hong Kong, Singapore, Busan, Yokohama, Sydney, and Auckland, while strategic areas include the Bering Strait, Strait of Malacca (gateway to the Pacific via Indian Ocean), Sunda Strait, and Torres Strait. Historical events shaped the region: Magellan's circumnavigation, the Battle of Midway, Pacific Campaign (World War II), and decolonization movements in French Polynesia, Guam, American Samoa, and New Caledonia. Contemporary issues include fisheries governance under the Western and Central Pacific Fisheries Commission, maritime disputes in the South China Sea, climate-driven sea-level rise threatening Tuvalu, Kiribati, and Marshall Islands, and strategic competition involving United States, China, Japan, Australia, and India.