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Grande-Terre
Grande-Terre is the eastern, flat limestone island of mainland Guadeloupe in the Lesser Antilles, separated from volcanic Basse-Terre by the Rivière Salée; about 590 km², sugar cane economy, main town Pointe-à-Pitre.
Grant Island
Grant Island is the name of several islands, chiefly an ice-covered Antarctic island off Marie Byrd Land, 20 mi long, charted by USS Glacier in 1962 and named for Cdr. E.G. Grant; also places in Alaska, Canada, and Oceania, and Grant Land in Ellesmere Island.
Grauspitz
Grauspitz (Vorder Grauspitz), 2,599 m, is Liechtenstein's highest mountain, a double summit with the 2,574 m Hinter Grauspitz (Schwarzhorn) in the Rätikon on the Swiss border, climbed via an exposed UIAA 1-2 ridge with no maintained trail.
Gravity hill
Gravity hill, also called magnetic hill, spook hill, or mystery spot: a road where an optical illusion from an obstructed horizon makes a downhill slope look uphill, so cars in neutral appear to roll uphill; measurements find no gravity anomalies.
Great Barrier Island
Great Barrier Island, known in Māori as Aotea, is an island in the outer Hauraki Gulf of New Zealand, about 100 km northeast of Auckland, named Great Barrier by James Cook in 1769.
Great Basin
The Great Basin, also known as Gran Cuenca, is a roughly 200,000-square-mile region of the western United States where rivers drain inland with no outlet to the sea.
Great Basin Desert
Great Basin Desert: the only cold desert of the four US deserts, a high-elevation internally drained sagebrush region of Nevada and neighboring states, created by the Sierra Nevada rain shadow, averaging under 10 inches of precipitation yearly, mostly as snow.
Great Britain
Great Britain is the largest island of the British Isles, containing England, Scotland, and Wales; the UK adds Northern Ireland. Area 209,331 km2, united as the Kingdom of Great Britain in 1707, separated from Europe by Doggerland's flooding about 7000 years ago.
Great Dividing Range
Great Dividing Range, also called Eastern Highlands or Great Divide: Australia's eastern highland and watershed system, about 3,500-4,000 km from Cape York to the Grampians, highest at Mount Kosciuszko, 2,228 m.
Great Hungarian Plain
The Great Hungarian Plain (Alföld, Nagy Alföld) is the large eastern-Hungarian lowland of the Pannonian Basin, Hungary's main agricultural region, distinguished by extreme flatness, Tisza River floodplains, severe drought exposure, and drained former wetlands.
Great Nicobar Island
Great Nicobar: largest and southernmost island of India's Nicobar archipelago, 910 sq km, UNESCO biosphere reserve, home of the Shompen and Nicobarese, and site of the contested Rs 81,000-crore port, airport, township and power plant project.
Great Orme
Great Orme (Pen y Gogarth, Y Gogarth): 207-metre limestone headland at Llandudno, north Wales, with Bronze Age copper mines, SSSI/SAC and Heritage Coast designations, Kashmiri goats, and Britain's only cable-hauled public-road tramway (1902).
Great Plains
Great Plains: North American grassland region east of the Rocky Mountains, also called the High Plains, spanning about 725,000 km2. Defined by tallgrass, mixed-grass, and shortgrass prairie zones and the depleting Ogallala Aquifer.
Great Rann of Kutch
The Great Rann of Kutch, also spelled Kachchh, is a vast salt-encrusted seasonal marsh in Gujarat, India, extending into Sindh, Pakistan; it floods during the monsoon.
Great Rift Valley
Great Rift Valley: vast tectonic depression from the Jordan valley through the Red Sea and East Africa to Mozambique, where the Nubian and Somalian plates pull apart, forming lakes, volcanoes, and hominin fossil sites.
Great Salt Lake Desert
Great Salt Lake Desert: arid northwestern Utah basin, remnant bed of pluvial Lake Bonneville, containing the Bonneville Salt Flats, potash mining at Salduro, land speed racing, and Dugway dust sources.
Great Sandy Desert
Great Sandy Desert: arid dunefield region of central northern Western Australia extending into the Northern Territory; 267,250 km² desert (395,250 km² bioregion), spinifex grasslands, 223 mm median rainfall, crossed by Carnegie in 1896.
Great Smoky Mountains
The Great Smoky Mountains are a mountain range along the Tennessee–North Carolina border in the southern Appalachians, at the heart of the most visited US national park.
Great Victoria Desert
The Great Victoria Desert, also called Victoria Desert, is Australia's largest mainland desert, covering about 348,750 km² across Western Australia and South Australia; Ernest Giles crossed it in 1875 and named it after Queen Victoria.
Great Vlachia
Great Vlachia (Μεγάλη Βλαχία) was the medieval name for Thessaly and neighboring parts of Greece, home to Vlach herders and independent from 1204 under the Angelos rulers.
Greater and Lesser Tunbs
Greater and Lesser Tunbs (Tunb-e Bozorg and Tunb-e Kuchak): two Persian Gulf islands near the Strait of Hormuz seized by Iran on 30 November 1971 and claimed by the UAE emirate of Ras al-Khaimah; militarized by Iran, disputed at the UN, and struck during the 2026 war.
Greater Antilles
Greater Antilles: large West Indies island group (Cuba, Hispaniola, Jamaica, Puerto Rico, usually Cayman and Virgin Islands), ~211,000 km², ~38 million people; old continental-fragment geology unlike the Lesser Antilles arc.
Greater Khingan
Greater Khingan (大兴安岭, Da Hinggan Ling) is a 1,400-km NNE-SSW mountain range in northeastern China and eastern Mongolia, separating the Mongolian Plateau from the Songliao Plain and marking China's monsoon, steppe, and topographic-step boundaries.
Greater Sunda Islands
Greater Sunda Islands: Borneo, Sumatra, Java, and Sulawesi, the large western islands of the Malay Archipelago on the shallow Sunda Shelf, land-bridged during Pleistocene lowstands and bounded east by Wallace's Line.
Greenland ice sheet
The Greenland ice sheet (GrIS) is the ice sheet covering about 80 percent of Greenland: 1.7 million km², over 3 km thick, 7.4 m sea-level equivalent, losing mass annually since the late 1990s.
Greenwich Island
Greenwich Island, South Shetland Islands, Antarctica; site of Chile's Arturo Prat station (1947) in Chile Bay, retreating glaciers, and the Yankee Harbour gentoo penguin Key Biodiversity Area.
Gregory Range
Gregory Range: name of two Australian ranges, one in the Pilbara, Western Australia (Fortescue Group inlier, manganese), one in Queensland, a sandstone offshoot of the Great Dividing Range between the Gilbert and Flinders rivers.
Grenadines
The Grenadines are 35 small islands between Grenada and St. Vincent in the Lesser Antilles, split between two countries, known for the Grenadine Bank's extensive coral reefs, yachting, Carriacou, Bequia, and 2024's Hurricane Beryl.
Grès à Reptiles Formation
Grès à Reptiles Formation (Argiles et grès à reptiles), Late Cretaceous sandstone and claystone unit of southern France, 83.5–66 Ma, Late Campanian–Early Maastrichtian, famous for dinosaurs such as Rhabdodon and Ampelosaurus; also a correlative sandstone level in the Spanish Pyrenees.
Groom Lake (salt flat)
Groom Lake, also called Groom Dry Lake, is a 4,440-foot-elevation salt flat (playa) in southern Nevada about 80 miles from Las Vegas, chosen in 1955 for secret U-2 testing and now the site of the Area 51 installation, with names Watertown, Paradise Ranch, and Dreamland.