Geography of Guam
Location:
Oceania, island in the North Pacific Ocean, about three-quarters of the way from Hawaii to the Philippines
Map references:
Oceania
Area:
Area - comparative:
three times the size of Washington, DC
Land boundaries:
0 km
Coastline:
125.5 km
Maritime claims:
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-rising hills in center, mountains in south
Elevation extremes:
Natural resources:
fishing (largely undeveloped), tourism (especially from Japan)
Land use:
Irrigated land:
NA sq km
Natural hazards:
frequent squalls during rainy season; relatively rare, but potentially very destructive typhoons (especially in August)
Environment - current issues:
extirpation of native bird population by the rapid proliferation of the brown tree snake, an exotic species
Geography - note:
largest and southernmost island in the Mariana Islands archipelago; strategic location in western North Pacific Ocean

(detailed map)
Geographic coordinates:
13 28 N, 144 47 E
total:
541.3 sq km
land:
541.3 sq km
water:
0 sq km
exclusive economic zone:
200 nm
territorial sea:
12 nm
lowest point:
Pacific Ocean 0 m
highest point:
Mount Lamlam 406 m
arable land:
11%
permanent crops:
11%
permanent pastures:
15%
forests and woodland:
18%
other:
45% (1993 est.)