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
Mermaid's Grotto lies along the west coast of Okinawa, Japan, in an area shaped by the limestone terrain typical of the Ryukyu Islands, where coral reef sits over ancient karst formations that have eroded into caves and swim-throughs. The site reaches a maximum depth of around 40 metres and is rated an advanced dive, consistent with the depth and the cave-like structure divers navigate here. It sits within reach of dive operations based on the Okinawa mainland.
AI overviewMarine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Tawny Hermit CrabCoenobita rugosusReported here · unconfirmed
Dark Red-spined Brittle StarOphiothrix (Acanthophiothrix) purpureaReported here · unconfirmed
Ten-lined UrchinEucidaris metulariaReported 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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