All articles starting with O
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Okefenokee Swamp
Okefenokee Swamp: a nearly 700-square-mile blackwater peatland in southeast Georgia, headwaters of the Suwannee and St. Marys rivers, a National Wildlife Refuge since 1937 and a UNESCO World Heritage site since 2026.
Oken (lunar crater)
Oken is a 78.67-km-wide lunar impact crater at 43.76S, 76.09E in the southern near-side highlands, named in 1935 for German biologist-physiologist Lorenz Oken (1779-1851), with satellite crater Oken E.
Okene
Okene is a city and LGA headquarters in Kogi State, Nigeria, cultural center of the Ebira people and seat of the Ohinoyi; 2006 census 325,623, known for cloth weaving and trade.
Oketeyeconne, Georgia
Oketeyeconne was a historic Creek (Muscogee) town on the east bank of the Chattahoochee River in Clay County, Georgia, north of Fort Gaines; abandoned in the 1800s and now submerged under Walter F. George Lake.
Okey
Okey is a traditional Turkish four-player tile game of the rummy family, played with 106 tiles (1-13 in four colors plus two false jokers). Its joker is redetermined each round by an indicator tile; hands of sets, runs, or seven pairs win.
Okhaharan
Okhaharan (ઓખાહરણ) is a classical Gujarati akhyana, a sung narrative poem, composed by Premanand around 1667 across 93 cantos on the love of Okha, daughter of Banasura, and Aniruddha, grandson of Krishna.
Okhin-Tengri Corona
Okhin-Tengri Corona is a corona, a quasi-circular volcano-tectonic feature, on Venus in the Lada Terra region, lying on the Alpha-Lada extensional belt with the Otygen and Demvamvit Coronae.
Okhotsk Coast
Okhotsk Coast (FEOW ecoregion 614): Russian Far East freshwater ecoregion of short coastal rivers draining the Sea of Okhotsk coast from Gizhiginskaya Guba Bay to the Kiran River, marked by charr diversity and absence of Coregonidae and Amur fauna.
Okhotsk Tokkari Center
Okhotsk Tokkari Center (オホーツクとっかりセンター), Mombetsu, Hokkaido; Japan's only seal rescue and rehabilitation facility, founded 1987, releasing recovered spotted and ringed seals to the Sea of Okhotsk.
Okhrana
Okhrana (Ohranka), the political police of the Russian Empire from 1881 to 1917, a set of agencies inside the Department of Police at Fontanka 16 that surveilled revolutionaries at home and from Paris, using agents provocateurs before its abolition in 1917.
Oki Islands UNESCO Global Geopark
Oki Islands UNESCO Global Geopark (隠岐ユネスコ世界ジオパーク) covers four inhabited islands in the Sea of Japan off Shimane, Japan; designated 2013, UNESCO 2015, third revalidation 2025, area 673.5 km².
Oki's Movie (옥희의 영화)
Oki's Movie (옥희의 영화, Ok-hui-ui yeonghwa) is Hong Sang-soo's 2010 South Korean comedy-drama, his 11th feature: four chapters about film student Oki, Professor Song, and filmmaker Jingu, premiering at Venice 2010.
Okie
Okie: 1930s California slur, short for Oklahoma, for poor Dust Bowl-era migrants from Arkansas, Missouri, Oklahoma, and Texas; later reclaimed as a badge of Oklahoman pride.
Okieriete Onaodowan
Okieriete "Oak" Onaodowan (born 1987, New Jersey) is an American actor who originated Hercules Mulligan and James Madison in Broadway's Hamilton and played Dean Miller on Station 19; also starred in Demascus and The Great Comet.
Okihide Hikosaka
Okihide Hikosaka is a Japanese neurophysiologist and Distinguished Investigator at the National Eye Institute, NIH, known for showing how the basal ganglia link reward to action.
Okihiro syndrome
Okihiro syndrome, or Duane-radial ray syndrome (DRRS), is a rare autosomal dominant SALL4-related disorder combining Duane anomaly with radial ray malformations, hearing loss, and renal and cardiac defects.
Okike
Okike is a Nigerian literary journal founded in 1971 by Chinua Achebe at the University of Nigeria, Nsukka, to publish African creative writing and criticism.
Okinawa
Okinawa (沖縄県), Japan's southernmost prefecture of 160 islands, former Ryukyu Kingdom annexed in 1879, reverted from US rule in 1972; hosts about 70% of US military facilities in Japan on 0.6% of its land.
Okinawa Children's Zoo & Museum
Okinawa Children's Zoo & Museum (沖縄こどもの国) is a zoo and children's museum in Okinawa City, Japan, opened in 1970; it holds about 1,000 animals and Okinawa's only children's museum.
Okinawa Churaumi Aquarium
Okinawa Churaumi Aquarium (沖縄美ら海水族館), in Motobu, Okinawa, Japan, opened November 2002; its 7,500 m³ Kuroshio Sea tank holds whale sharks and manta rays, with world-first captive breeding records.
Okinawa Electric Power Company
The Okinawa Electric Power Company, Incorporated (沖縄電力, OEPC) is the vertically integrated electric utility serving Japan's Okinawa Prefecture, founded in 1972 and privatized in 1988. Its isolated grid runs mainly on coal, LNG, and oil.
Okinawa Island (沖縄)
Okinawa Island (沖縄島, Okinawa-jima), also Okinawa Main Island, is the largest Ryukyu island, Japan: about 1,207 km², 1.35 million people, Naha capital, Ryukyu Kingdom heritage, 1945 battle, US bases.
Okinawa Slow Wind Forest
Okinawa Slow Wind Forest (風楽風遊の森) is a themed forest attraction at 2146 Chibana, Okinawa City, Japan, part of the Southeast Botanical Gardens resort; its name ties to the local 'Slow' regional currency used for admission discounts.
Okinawan kobudō (沖縄古武道)
Okinawan kobudō (沖縄古武道), the Okinawan weapons art using bō, sai, tonfa, nunchaku, and kama; developed in the Ryukyu Kingdom among the Pechin class and systematized by Yabiku Moden and Taira Shinken.
Okinawan language
The Okinawan language, known natively as Uchināguchi, is a Ryukyuan language of southern Okinawa Island, so different from Japanese that the two are not mutually intelligible.
Okinawan martial arts
Okinawan martial arts (沖縄空手, kobudō): karate and weapons traditions from the Ryukyu Kingdom, rooted in the art Ti, shaped by Chinese kempo, weapon bans, and spread worldwide since 1922.
Okinohata Aquarium
Okinohata Aquarium (おきのはた水族館) was a small private aquarium in Yanagawa, Fukuoka, opened April 2010 by fish-market chief Kondo Junzo to display Ariake Sea species; since 2016 it continues as the Yanagawa Ariake Sea Aquarium run by NPO SPERA with student directors.
Okinotorishima (沖ノ鳥島)
Okinotorishima (沖ノ鳥島), also called Parece Vela, is a coral reef about 1,700 km south of Tokyo that is Japan's southernmost island, with only two small islets above sea level.
Okipa
The Okipa, also written O-kee-pa, was the most complex religious ceremony of the Mandan people of North Dakota, a four-day summer ritual retelling creation and securing the buffalo's return.
Okipeta Dorsa
Okipeta Dorsa is a 1,200-km ridge system (dorsum) on Venus at 67.5°N, 240°E, IAU-approved in 1985 and named for the Greek goddess of whirlwind; it is one of twelve linear belts in the Pandrosos Dorsa quadrangle.