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
Manzo Ana (マンゾウ穴) is a cave dive 25 minutes by boat from Chichijima in the Ogasawara Islands, Tokyo, with a maximum depth of 14 m and an average around 10 m. A cave opens onto white sand, and its exit is heart-shaped. Drummers, razorfish and whitetip reef sharks are seen, and Indo-Pacific bottlenose dolphins are encountered here more often than at most sites; current runs and the dive suits intermediate divers and above.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Rippled RockskipperIstiblennius edentulusReported here · unconfirmed
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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