Geography & environment — Guam
Location, land area, terrain, climate, and natural resources.
Profile updated 2026-06-02
⚡ Geography & environment at a glance
Location, land area, terrain, climate, and natural resources. Key figure for Guam: Oceania
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Location & size
- Geographic Location
Oceania
- Geographic Coordinates
13 28 N, 144 47 E
- Total Area
210 Square Miles 544 Square Kilometers
- Land Area
210 Square Miles 544 Square Kilometers
- Coastline
78 Miles 125 Kilometers
Physical geography
- 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
- Highest Point
406 Meters
- Highest Point Location
Mount Lamlam 406 m
- Lowest Point Location
Pacific Ocean 0 m
- Natural Resources
Fishing (largely undeveloped), tourism (especially from Japan)
- Irrigated Land
1 Square Miles 2 Square Kilometers
Climate & time
- Time Zone
UTC+10 (15 hours ahead of Washington, DC, during Standard Time)
Climate
- 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
- Location
Oceania, island in the North Pacific Ocean, about three-quarters of the way from Hawaii to the Philippines
- Total Area
210 Square Miles 544 Square Kilometers
Environment
- Environment - Current Issues
Extirpation of native bird population by the rapid proliferation of the brown tree snake, an exotic, invasive species