Tucked inside Naval Base Guam on the shores of Apra Harbor, Gab Gab Beach pairs an easy stair-step entry with a swimming-pool-calm lagoon that opens onto a multi-tiered coral reef just past the buoy line. Snorkelers regularly report sea turtles, white-tip reef sharks, moray eels, and clownfish tucked into anemones along the drop-off, which plunges past 30 meters into the harbor itself. The marked swim area stays a gentle 1-5 meters deep, visibility can run 20-30 meters on a good day, and the water sits at a balmy 28-29°C year-round. As of 2026 it's still base property — you need military ID or a sponsor to get on — which keeps it far less crowded than Guam's public beaches.
Easy stair entry with a steel handrail into a buoy-marked swim area
Coral canyon at the drop-off (30m+) with brain coral reportedly 'the size of a Volkswagen'
Frequent sightings of turtles, white-tip reef sharks, moray eels, and anemonefish
Covered picnic tables and BBQ grills, plus SUP/gear rental at Sumay Cove Marina & Adventure Center
Warm 28-29°C water year-round, with peak visibility in the dry season (Feb-Apr)
Good to know
SafetyStay inside the buoy-marked swim area — Apra Harbor is an active shipping lane for Navy vessels and submarines, and drifting past the boundary puts you in real vessel traffic.
SafetyThe last step down to the water gets slippery, so use the handrail. Don't snorkel alone, and watch for mask fog and fatigue on the swim back.
SafetyDon't touch coral, anemones, or moray eels — the main injury risk here is a sting or scrape, not depth.
RulesThis is Naval Base Guam property: you need a military ID, or an active-duty/DoD sponsor plus a valid photo ID arranged in advance — there's no walk-on civilian access.
RulesNo touching or collecting marine life and no standing on coral — the reef is protected under base conservation rules.
MannersKeep your distance from turtles and reef sharks and never feed them.
SeasonVisibility and calm seas peak in the dry season (roughly December-June, best Feb-Apr); the wet/typhoon season runs July-November, with July-September carrying the highest storm risk. Water stays 28-29°C year-round either way.
Practical info
Entry is through the Naval Base Guam gate in the Santa Rita/Apra Harbor area; civilians need a military or DoD sponsor to arrange a visitor pass in advance, since there's no commercial snorkel tour operating on base. Gear rentals (SUP, etc.) are available at Sumay Cove Marina & Adventure Center. Access rules shift, so confirm current entry procedures with base MWR before you go.
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