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Jeju Island (제주도)
Jeju Island, or Jejudo, is a volcanic island off the southern coast of South Korea whose Hallasan, at 1,950 meters, is the country's highest mountain.
Jeju Volcanic Island and Lava Tubes
Jeju Volcanic Island and Lava Tubes, a UNESCO World Heritage site inscribed in 2007, comprises Hallasan Natural Reserve, Seongsan Ilchulbong tuff cone, and the Geomunoreum Lava Tube System on Jeju Island, South Korea, famed for carbonate-decorated lava caves.
Jekyll Island
Jekyll Island is a 5,700-acre Georgia barrier island and State Park in Glynn County, formerly the exclusive Jekyll Island Club, purchased by the state in 1947 and managed by the Jekyll Island Authority.
Jenny Lind Island
Jenny Lind Island (Qikiqtaryuaq), Nunavut island in Queen Maud Gulf about 20 km off Victoria Island, named by explorer John Rae for the Swedish soprano Jenny Lind; a declining Lesser Snow Goose and Ross's Goose breeding colony and Important Bird Area.
Jens Munk Island
Jens Munk Island names two Arctic islands honoring explorer Jens Munk: Kapuiviit (ᑲᐳᐃᕖᑦ), a 920 km² uninhabited island in Foxe Basin, Nunavut, Canada, and Jens Munks Ø, a 471 km² island in Sermersooq, Greenland.
Jens Munk Ø
Jens Munk Ø (Jens Munk Island, Jens Munks Ø) is an uninhabited 493 km² island in the Søren Norby Islands, Sermersooq, eastern Greenland, named for explorer Jens Munk; distinct from the Nunavut island of the same name.
Jezreel Valley (עמק יזרעאל)
The Jezreel Valley (Emek Yizre'el; Marj ibn Amir; Plain of Esdraelon) is a 48-km inland plain in northern Israel, a historic trade route, drained and settled in the 1920s, now farmed by the Jezreel Valley Regional Council.
Jiuding Shan
Jiuding Shan (九顶山) is a mountain in Sichuan, China, and the highest peak of the Longmen Shan range at about 4,969 meters, within a nature reserve holding wild giant pandas.
Jiufotang Formation
Jiufotang Formation (九佛堂组), Lower Cretaceous lacustrine unit in western Liaoning, China, upper Jehol Group; deposited 124.44–112.25 Ma, hosts late Jehol Biota fossils including Microraptor and Jeholornis.
Jiulongshan Formation
The Jiulongshan Formation (九龙山组), called the Haifanggou Formation in Liaoning, is a Middle Jurassic rock unit in northeastern China, known for the fossil-rich Daohugou beds of the Yanliao Biota.
Jocotitlan
Jocotitlán (Xocotépetl) is an active 3,911 m stratovolcano in the Trans-Mexican Volcanic Belt, 60 km WNW of Mexico City; last erupted 1270 CE, with a 9,700-year-old debris avalanche, and ranks highest in exposure among Mexican volcanoes.
Joerg Peninsula
Joerg Peninsula: rugged mountainous peninsula, about 20 by 8 miles, between Trail and Solberg Inlets on the east coast of the Antarctic Peninsula; first charted by the USAS in 1940, named in 1952 for W. L. G. Joerg.
John Volanthen
John Volanthen (Jonathan Volanthen) is a British cave diver from Bristol who, with Rick Stanton, first located the 12 boys trapped in Thailand's Tham Luang cave in 2018, holds the world record for the longest cave dive (over 10 km at Pozo Azul), and received the George Medal.
Johnston Atoll
Johnston Atoll, an uninhabited U.S. Pacific atoll 716 nautical miles southwest of Honolulu, is a National Wildlife Refuge within the Pacific Islands Heritage Marine National Monument, formerly used for nuclear testing and chemical weapons disposal.
Joinville Island (landform)
Joinville Island (Islas Joinville), largest island of the Joinville archipelago at the northeastern tip of the Antarctic Peninsula, charted by d'Urville in 1838 and named after Prince de Joinville; geologically continuous with Trinity Peninsula.
Jon Lindbergh
Jon Morrow Lindbergh (1932–2021), son of Charles and Anne Morrow Lindbergh, was an American cave-diving pioneer, Navy UDT frogman, commercial diver, and 1964 Man-In-Sea aquanaut who later developed salmon aquaculture.
Jonassen Island
Jonassen Island: Antarctic island about 2.5 mi long in the southern entrance to Antarctic Sound, off the NE Antarctic Peninsula tip. Formerly Irizar Island, renamed for Ole Jonassen of Nordenskjöld's Swedish expedition.
Jones Mountains
Jones Mountains, Antarctica: small ice-covered mountain group in western Ellsworth Land near the Eights Coast, part of the Thurston Island block, with Miocene subglacial basalts and a 33 km glacial unconformity evidencing pre-Quaternary glaciation.
Jos Plateau
Jos Plateau (formerly Bauchi Plateau), upland in north-central Nigeria's Plateau State, averaging about 1,200-1,300 m with Shere Hills near 1,829 m; temperate climate, Younger Granite tin fields, source of Kaduna, Gongola, Hadejia, Yobe rivers.
Jostedalsbreen
Jostedalsbreen, Norway's largest glacier and the largest ice cap on the European mainland (458 km², 2019), an ice cap in Vestland county, western Norway; 81 outlet glacier units, Little Ice Age maximum around 1755, ongoing retreat and projected halving by 2100.
Juan Fernández Islands
Juan Fernández Islands: Chilean volcanic archipelago 650 km offshore, three islands (Robinson Crusoe, Alejandro Selkirk, Santa Clara), discovered 1574, famed for endemism, Selkirk castaway story, national park and biosphere reserve.
Judith River Formation
Judith River Formation: Campanian Upper Cretaceous mudstone-siltstone-sandstone unit of Montana, Alberta, and Saskatchewan, named by Hayden (1871), dinosaur-bearing, equivalent to the Belly River Group.
Juneau Icefield
Juneau Icefield: large plateau icefield in the Coast Mountains of Alaska and British Columbia, stretching 90 miles from Juneau toward Skagway; over 1,000 glaciers, accelerating ice loss since 2005, home of the Juneau Icefield Research Program since 1946.
Jungfrau
Jungfrau (4,158 m), Bernese Alps peak on the Bern–Valais border, highest of the Eiger–Mönch–Jungfrau trio; first Swiss 4000er climbed, in 1811 by the Meyer brothers; Jungfraujoch railway station at 3,545 m.
Jungfraujoch
Jungfraujoch is a 3,454 m col in the Swiss Bernese Alps between the Jungfrau and Mönch, site of Europe's highest railway station and a high-altitude research station.
Junipero Serra Peak
Junipero Serra Peak (Pimkolam; formerly Santa Lucia Peak) is the highest summit of the Santa Lucia Mountains and Monterey County, California, about 5,862 ft, in the Ventana Wilderness, Los Padres National Forest, with isolated sugar pine forest.
Jura Mountains
Jura Mountains (Massif du Jura, Juragebirge): sub-alpine fold-and-thrust range on the French-Swiss border north of the Western Alps, namesake of the Jurassic period, thin-skinned tectonics above a Triassic evaporite décollement, highest Swiss peak Mont-Tendre 1,679 m.
Jurien Island
Jurien Island is a small Antarctic island northeast of Cape Leguillou, Tower Island, Palmer Archipelago, charted and named Île Jurien by d'Urville's French expedition on 4-5 March 1838.
Jutland
Jutland, known in Danish as Jylland, is the northern European peninsula that forms mainland Denmark, bordered by the North Sea, the Skagerrak, and the Kattegat, and holding more than two-thirds of Denmark's land area.
K’gari
Fraser Island, officially named K'gari since 2023, is the world's largest sand island, lying off southern Queensland, Australia, and inscribed on the World Heritage List in 1992.