Geography and Environment

Geography and Environment of Guam

Terrain, climate, natural resources, hazards, and environmental conditions of Guam.

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
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
Highest Point: 406 — Mount Lamlam 406 m
Lowest Point: Pacific Ocean 0 m

Natural Resources: fishing (largely undeveloped), tourism (especially from Japan)
Natural Hazards: frequent squalls during rainy season; relatively rare, but potentially very destructive typhoons (June - December)

Current Environmental Issues: extirpation of native bird population by the rapid proliferation of the brown tree snake, an exotic, invasive species

Detailed geography