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.
Dived here today? How were conditions vs. what we showed?
About this site
Maguro Ana (マグロ穴) off Hahajima in the Ogasawara Islands, Tokyo, is a reef site 15 minutes by boat with a maximum depth of 40 m. In season, dogtooth tuna pack into the hole in the rock, and the deeper water holds rare anthias including the Bonin anthias, along with purple firefish and dartfish, many nudibranch species, giant trevally, amberjack, black trevally, fusiliers and green turtles. When the current runs it is fast; the site is for intermediate to advanced divers.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Merulina ampliataReported 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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