Landforms and terrestrial features

Xuelian Feng

Xuelian Feng (雪莲峰, Snow Lotus Peak) is a 6,627 m ultra-prominent peak in the Chinese Central Tian Shan, Xinjiang, first climbed in 1990 by Japanese climbers; its satellite peaks were first ascended in 2009.

Yablonoi Mountains

Yablonoi Mountains (Russian: Яблоновый хребет, Yablonovy khrebet), also Yablonovy Range, a 650–700 km mountain range in Zabaykalsky Krai, Siberia, forming the Arctic–Pacific watershed; highest point Kontalaksky Golets, 1,706 m.

Yakedake

Yakedake (焼岳) is a 2,455 m active andesite-dacite stratovolcano with a summit lava dome on the Nagano-Gifu border above Kamikochi, Japan. Its 1915 phreatic eruption and lahar dammed the Azusa River, forming Taisho-ike; the 1995 Abo Tunnel steam explosion killed four workers.

Yaku-shima

Yaku-shima (屋久島, Yakushima) is a 504 km² granite island 60 km south of Kyushu, Japan, with 1,936 m Mount Miyanoura, ancient Yakusugi cedars, and a 10,747 ha World Heritage site inscribed in 1993.

Yamal Peninsula

Yamal Peninsula (Ямал), northern West Siberia, Russia: low Arctic peninsula into the Kara Sea with continuous permafrost, giant gas fields (Bovanenkovo), Nenets reindeer herders, and methane emission craters since 2014.

YAO SHAN

Yao Shan (药山, Medicine Mountain), also Jiaoding Shan, is a 4,042 m Ultra-prominence peak in Qiaojia County, Zhaotong, Yunnan, China, named for its 856 medicinal plant species and protected by Yaoshan National Nature Reserve; distinct from smaller Yao Shan hills in Guangdong and Guilin.

Yaomei Feng

Yaomei Feng (幺妹峰), or Fourth Girl Peak, is the 6,247.8 m granite main summit of the Siguniang massif in the Qionglai Mountains, Sichuan, China; second highest in Sichuan, first climbed in 1981 by a Japanese Doshisha University team.

Yap

Yap is the westernmost state of the Federated States of Micronesia, midway between Guam and Palau, with four main volcanic islands, about 134 outer atolls, stone money (rai), and heavy US Compact aid.

Yarlung Tsangpo Grand Canyon

Yarlung Tsangpo Grand Canyon (雅鲁藏布大峡谷), the world's deepest canyon in Tibet, cut by the Yarlung Tsangpo around Namcha Barwa; over 5,000 m deep, 500 km long, a nature reserve and hydropower site.

Yas Island (جزيرة ياس)

Yas Island (جزيرة ياس) is a 25 sq km Abu Dhabi island developed since 2006 by Aldar and Miral, home to Ferrari World, Warner Bros. World, SeaWorld, Yas Marina Circuit, Yas Mall, a Dh12 billion Miral investment program and Disney's announced seventh theme park.

Yate

Yate (Volcán Yate) is a 2,187 m basaltic-andesite stratovolcano on Chile's Hualaihué peninsula, Southern Andean Volcanic Zone; last confirmed eruption 1090 ± 60 CE; a 1965 landslide tsunami killed 27.

Yin Mountains

Yin Mountains (阴山山脉, Yinshan), an east-west range about 1,000 km long in central Inner Mongolia and northern Hebei, highest peak Hohè Bāshìgé 2,364 m; the historic farming-pastoralism frontier, Great Wall corridor, and home of the Yinshan petroglyphs.

Ymer Ø

Ymer Ø (Ymer Island) is a 2,437 km² island in East Greenland between Sofia Sund and Kejser Franz Joseph Fjord, named in 1899 by A.G. Nathorst after the Swedish journal Ymer; known for Holocene lake-sediment studies and tungsten-antimony deposits.

Yokodake

Yokodake (横岳), 2,480 m stratovolcano in Nagano, Japan, the only active volcano of the Yatsugatake group; last erupted ca. 1200 CE, with Y9 lava at ca. 0.6 ka and a stable eruption rate of about 10^-2 km3/ky.

Yonaguni

Yonaguni (与那国島) is Japan's westernmost island, in the Yaeyama group of Okinawa Prefecture, 111 km from Taiwan. Known for the disputed Yonaguni Monument, Kuroshio crossings, and Camp Yonaguni radar base.

Yorkshire Dales

The Yorkshire Dales is Britain's largest limestone karst region, in the Pennines, with nearly half of Britain's known caves and famous sites such as Malham Cove.

Yoronjima (与論島)

Yoronjima (与論島), or Yoron Island, is the southernmost island of the Amami Islands, Kagoshima Prefecture, Japan, in Amami Gunto National Park. A 55 km2 coral-fringed island with 9.4 km2 of reef, 1998 bleaching killed 70-90% of south-coast corals.

Yos Sudarso Island

Kolepom, also called Pulau Yos Sudarso or Dolak, is a large Indonesian island off the south coast of New Guinea, separated from the mainland by the Muli Strait.

Yoteizan

Yoteizan (羊蹄山, Mount Yotei, Ezo Fuji) is a 1,898 m symmetrical andesitic-dacitic stratovolcano in southwestern Hokkaido, Japan, NW of Toya caldera; last erupted about 2,500 years ago, no historical eruptions.

Yuanshan Formation

The Yuanshan Formation is an Early Cambrian rock unit in Yunnan, China, host of the Chengjiang biota, one of the most significant soft-bodied Cambrian fossil assemblages.

Yucatán Peninsula

Yucatán Peninsula: limestone karst platform in southeastern Mexico (Campeche, Yucatán, Quintana Roo, plus Belize and northern Guatemala), home of cenotes, the Chicxulub impact crater, Maya heritage, and tropical forest under tourism and Tren Maya pressure.

Yukon Plateau

Yukon Plateau: dissected upland physiographic region of central Yukon and east-central Alaska (Yukon-Tanana upland), defined by Bostock (1948), between Selwyn and Coast mountains, partly glaciated by Cordilleran ice, with a Late Cretaceous erosion surface.

Yunnan-Guizhou Plateau

Yunnan-Guizhou Plateau (云贵高原, Yungui Plateau): karst plateau in southwestern China covering most of Yunnan and Guizhou, elevation 400–3500 m, humid subtropical, one of the world's most developed karst landscapes and a second-stage terrain of China.

Zagros Mountains

Zagros Mountains: fold-and-thrust belt of western and southwestern Iran, about 1,600 km long, formed by Arabia-Eurasia collision; seismically active, oil-bearing, oak-forested, and the source of over half of Iran's water.

Zakynthos (Ζάκυνθος)

Zakynthos (Ζάκυνθος), or Zante, a Greek Ionian Sea island: third largest Ionian island, 406 km², 41,180 residents, about 2 million tourists yearly, home of Navagio beach and Caretta caretta nesting sites.

Zanzibar Island

Zanzibar Island (Unguja) is the largest island of Tanzania's semi-autonomous Zanzibar Archipelago, 1,666 km², about 40 km off the mainland, with 1.9 million people, a tourism-dominated economy near 30% of GDP, and UNESCO-listed Stone Town.

Zapata Formation

Zapata Formation, Lower Cretaceous marine shale of the Rocas Verdes back-arc basin in Patagonian Chile (Ultima Esperanza, Torres del Paine); Tithonian–Albian, 1000–1200 m thick, source of the Tyndall ichthyosaurs; distinct from the Texas Zapata delta and the Antillean Zapata formation.

Zard Kuh

Zard Kuh (زردکوه بختیاری, "Yellow Mountain") is a 4,221 m sub-range in the central Zagros, Iran, in Chaharmahal and Bakhtiari Province; source of the Karun and Zayanderud rivers, with small glaciers and Bakhtiari nomad crossings.

Zarembo Island

Zarembo Island (Ostrov Zarembo, Duke of York Island) is an uninhabited 180-square-mile island in the Alexander Archipelago, Southeast Alaska, in the Tongass National Forest near Wrangell, bounded by Sumner and Stikine straits, with Tertiary lava flows and a timber-harvest history.