Bird Island Marine Sanctuary is a small limestone islet off Saipan's northeastern Marpi coast, protected both as a seabird nesting sanctuary and as a fully no-take marine reserve covering the surrounding waters. A steep, rope-assisted trail drops down to a secluded cove where snorkelers find some of the healthiest coral reefs in the CNMI, along with a wide variety of reef fish, occasional barracuda, and sometimes sea turtles. Depths run a shallow 1-8 m with excellent 20-30 m visibility, but the tricky access and stronger current near the island itself make it better suited to snorkelers with some experience rather than absolute beginners. As of July 2026, landing on the island is still prohibited, and the outing centers on the overlook and the cove snorkel spot facing it.
Secluded snorkel cove reachable only via a steep rope-assisted trail
Coral reefs rated among the healthiest in the CNMI
Diverse reef fish, occasional barracuda, and sometimes sea turtles
Iconic clifftop overlook with a postcard view of the island (top photo spot)
Pristine ecosystem protected as a fully no-take marine sanctuary
Good to know
SafetyThe rope-assisted descent down the limestone bluff is steep and can get slippery, so you need both hands free — a real fall risk if your footing or stamina isn't solid.
SafetyCurrent picks up the closer you get to the island itself, and wading out when the tide is turning can leave you stranded or swept off; don't attempt it alone.
SafetyThere's no lifeguard, no facilities, and cell signal is weak, so go with a buddy and bring your own water and basic first-aid.
SeasonEntry is easiest at mid-to-high tide; at low tide, exposed coral and rock make wading in difficult and raise the risk of cuts and scrapes.
RulesThe island and surrounding waters are a fully no-take marine sanctuary — no fishing or coral collecting, and landing on the island itself is prohibited to protect nesting seabirds.
MannersNever stand on or touch the coral, and if you spot a turtle, keep a respectful distance and don't feed it.
Practical info
From Garapan, drive to the Marpi area, park at the overlook, then follow the dirt road and rope-assisted trail down to the cove; many visitors join a guided snorkel tour rather than going independently. Fees, trail conditions, and tour availability change, so confirm current details locally before you go.
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