11-Mile Reef
Conditions & tides
Scored by DiveConnect's site-physics model
Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
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About this site
11-Mile Reef lies off the coast of Guam in the Mariana Archipelago, in the western Pacific waters of Micronesia. The reef takes its name from its distance out from a reference point along the Guam coastline, and it is reached by boat rather than from shore.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Princess DamselPomacentrus vaiuliReported here · unconfirmed
Tracey's DamselfishChrysiptera traceyiReported here · unconfirmed
Dusky SurgeonfishAcanthurus nigrofuscusReported here · unconfirmed
Pacific Bullethead ParrotfishChlorurus spilurusReported here · unconfirmed
Pacific Orange-spine UnicornfishNaso lituratusReported here · unconfirmed
Lined BristletoothCtenochaetus striatusReported here · unconfirmed
Ringtail Maori WrasseOxycheilinus unifasciatusReported here · unconfirmed
Fivestripe WrasseThalassoma quinquevittatumReported here · unconfirmed
Jewel DamselStegastes lacrymatusReported here · unconfirmed
Galaxy CoralGalaxea fascicularisObserved near here · iNaturalist
Blue LinckiaLinckia laevigataObserved near here · iNaturalist
Durable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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