Guam's Geography | Guam Geography

Location: Oceania, island in the North Pacific Ocean, about three-quarters of the way from Hawaii to the Philippines

Geographic coordinates: 13 28 N, 144 47 E

Map references: Oceania

Area: Total: 549 sq km land: 549 sq km water: 0 sq km

Area - comparative: Three times the size of Washington, DC

Land boundaries: 0 km

Coastline: 125.5 km

Maritime claims: Territorial sea: 12 nm exclusive economic zone: 200 nm

Climate: Tropical marine; generally warm and humid, moderated by northeast trade winds; dry season from January to June, rainy season from July to December; little seasonal temperature variation

Terrain: Volcanic origin, surrounded by coral reefs; relatively flat coralline limestone plateau (source of most fresh water), with steep coastal cliffs and narrow coastal plains in north, low hills in center, mountains in south

Elevation extremes: Lowest point: Pacific Ocean 0 m highest point: Mount Lamlam 406 m

Natural resources: Fishing (largely undeveloped), tourism (especially from Japan)

Land use: Arable land: 9.09% permanent crops: 16.36% other: 74.55% (2001)

Irrigated land: NA

Natural hazards: Frequent squalls during rainy season; relatively rare, but potentially very destructive typhoons (June - December)

Environment - current issues: Extirpation of native bird population by the rapid proliferation of the brown tree snake, an exotic, invasive species

Environment - international agreements:

Geography - note: Largest and southernmost island in the Mariana Islands archipelago; strategic location in western North Pacific Ocean

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