Play media This article describes the geography of the United States territory of Guam. Location Oceania, island in the North Pacific Ocean, about a quarter of the way from the Philippines to Hawaii, United States Geographic coordinates 13°26′31″N 144°46′35″E / 13.44194°N 144.77639°E / 13.44194; 144.77639 Map references Oceania Area Total: 544 km² Land: 544 km² Water: 0 km² Area (comparative) Three times the size of Washington, D.C. Land boundaries Approximately 30 miles (48 km) long and 9 miles (14 km) wide, narrowing to 4 miles (6.4 km) at the center. Coastline 125.5 km (78.0 mi) Maritime claims Territorial sea: 12 nmi (22 km) Exclusive economic zone: 200 nautical miles (370 kilometres) The southern maritime boundary of Guam forms a border with the Federated States of Micronesia, and the northern maritime boundary forms a border with the Commonwealth of the Northern Marianas Islands. Climate Tropical marine; generally warm and humid, moderated by northeast trade winds; dry season from January to June, wet season from July to December; little seasonal temperature variation. Terrain Volcanic origin, surrounded by coral reefs; relatively flat coralline limestone plateau (source of most freshwater), with steep coastal cliffs and narrow coastal plains in north, low-rising hills in center, mountains in south. Soils are mostly silty clay or clay and may be gray, black, brown or reddish brown; acidity and depth vary. Elevation extremes Lowest point: Pacific Ocean, 0 metres (0 feet) Highest points: Mount Lamlam, 406 meters (1,332 ft) Mount Jumullong Manglo, 391 meters (1,283 ft) Mount Bolanos, 368 meters (1,207 ft) Natural resources Commercial fishing (mostly servicing and unloading of longline fleets and commercial vessels), recreational fishing of Indo-Pacific Blue Marlin (Makaira mazara), Wahoo (Acanthocybium solandri), Mahi-mahi (Coryphaena hippurus), Yellowfin tuna (Thunnus albacares), and deepwater reef fish, tourism (especially from Japan but increasingly from China and South Korea). Land use Arable land: 1.85% Permanent crops: 16.67% Other: 81.48% (2012 est.) Irrigated land 2 km2 Natural hazards Frequent squalls during wet season; relatively rare, but potentially very destructive typhoons (typhoons are possible in any season but most common from August through December) Environment - current issues Extirpation of native bird population by the rapid proliferation of the Brown tree snake (Boiga irregularis), an exotic species. Island also supports feral populations of introduced deer, Pigs (Sus scrofa) and Carabao (Bubalus bubalis carabanesis). Geography - note Largest and southernmost island in the Mariana Islands archipelago; strategic location in western North Pacific Ocean.
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