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
Nagane (長根) is a calm cove site on Kozushima in the Izu Islands, Tokyo, suitable from beginner level with some current. The terrain is a plain boulder bottom, but it is known for schools of juvenile jacks and gnomefish and a reliably high rate of turtle sightings.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Decumbent Spanish DancerHexabranchus lacerReported 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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