Toilet Bowl
Conditions & tides
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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
Toilet Bowl, also known as Horseshoe North, is a reef dive at Onna Manza on Okinawa. It centres on a vertical wall that descends to more than 40 m, and it is rated intermediate to advanced. You can reach it from shore or by boat.
Sharks are often spotted nearby, especially early in the morning. Car-sized oceanic whitetip sharks are regular visitors, and the biggest are around 3 m long. They are not great whites and have not caused trouble for divers.
Schools of giant trevally and juvenile barracuda hang in these nutrient-rich waters, moray eels sit along the walls and nudibranchs crawl over the reef. During winter you can often hear migrating humpback whales singing.
Marine 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
Oceanic whitetip sharkOceanic whitetip sharkReported here · unconfirmed
TrevallyTrevallyReported here · unconfirmed
BarracudaBarracudaReported here · unconfirmed
WhaleWhaleReported here · unconfirmed
NudibranchNudibranchReported 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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