Total area: 541 km2
land area: 541 km2

Comparative area: slightly more than three times the size of Washington, DC

Land boundaries: none

Coastline: 125.5 km

Maritime claims:
Contiguous zone: 12 nm
Continental shelf: 200 m (depth)
Exclusive economic zone: 200 nm
Territorial sea: 12 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 coraline limestone plateau (source of most fresh water) with steep coastal cliffs and narrow coastal plains in north, low-rising hills in center, mountains in south

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

Land use: arable land 11%; permanent crops 11%; meadows and pastures 15%; forest and woodland 18%; other 45%

Environment: frequent squalls during rainy season; subject to relatively rare, but potentially very destructive typhoons (especially in August)

Note: largest and southernmost island in the Mariana Islands archipelago; strategic location in western North Pacific Ocean 5,955 km west-southwest of Honolulu about three-quarters of the way between Hawaii and the Philippines

NOTE: The information regarding Guam on this page is re-published from the 1991 World Fact Book of the United States Central Intelligence Agency. No claims are made regarding the accuracy of Guam Geography 1991 information contained here. All suggestions for corrections of any errors about Guam Geography 1991 should be addressed to the CIA.