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- Importance of Guam's reefs
- Health of Guam's reefs
- - Health intro
- - Reef health tour
- - - - Northern reefs
- - - - East-central and southeastern reefs
- - - - Apra Harbor reefs
- - - -Southwestern reefs
- - - - Western reefs
- Threats to Guam's reefs
- - Algae overgrowth
- - Anchor damage
- - Coral bleaching
- - Crown of thorns outbreaks
- - Debris
- - Disease
- - Divers/snorkelers/ swimmers
- - Illegal fishing
- - Kayaks and other human-powered watercraft
- - Ocean acidification
- - Overharvesting
- - Sedimentation
- - Sewage discharge
- - Stormwater runoff
- - Terpios sponge
- - Vessel groundings
- - Windsurf boards and kiteboards
- Current management
- Recommendations
- Get involved

Despite the critical importance of Guam’s coral reefs to so many aspects of life on the island, they remain under assault from a range of threats. While there are multiple threats affecting Guam's coral reefs, sedimentation, overfishing, and crown of thorns outbreaks are probably the most serious threats to Guam's reefs. Most of the threats currently affecting Guam's reefs are local in origin, a result of the activities we do here on the island or in the surrounding waters. But scientists around the world are warning of the increasing threat of impacts associated with global climate change. These threats, including coral bleaching, ocean acidification, and sea level rise, are expected to challenge even the most healthy reefs and could result in the loss of much of the world's coral reefs - including Guam's.