Access
Naha, Ishigaki, Miyako and Yonaguni airports. Cape Maeda is a shore entry with stairs and a crowd. Kerama is a boat from Naha / Zamami. Ishigaki manta sites are boat products. Yonaguni is a separate, remoter plan.
Okinawa Prefecture is a Ryukyu island chain southwest of mainland Japan whose recreational water includes Kerama Islands National Park (2014), Ishigaki's manta sites, the Blue Cave at Cape Maeda on the main island, and remoter Miyako and Yonaguni options.
Wow factor is high for a Japanese prefecture, a step below equatorial places in this atlas. Accessibility is middling-high: domestic flights and a few shore entries (Maeda), plus boats that wait on wind. Seasonality is moderate-high: a summer mass window and a winter that is still a wetsuit. Risk is moderate: cave overhead at Maeda, current at Kerama and Ishigaki, not wreck-penetration scores.
This chapter is a place atlas, not a certifying agency, not medical advice, and not a live briefing. Japan Coast Guard, national-park rules and the day's wind override any sentence here.
Local notes
Season
A commonly cited warm window is summer to early autumn. Winter is diveable in thicker rubber; wind closes Kerama and manta days. This is not a live forecast.
Agencies
Ministry of the Environment (Kerama NP), Okinawa prefecture, Japan Coast Guard, local fishery cooperatives. PADI/SSI shops are dense on the main island; they do not replace a park or cooperative brief.
Kerama NP2014 national park
Manta waterIshigaki / Kabira
Blue CaveCape Maeda
MiyakoIrabu / limestone
YonaguniAdvanced, remote
Not this pageA live briefing
Profile
Accessibility
56
Skill ceiling
52
Gear load
46
Risk
44
Seasonality
54
Wow factor
85
Seven chapters
Origins
From Ryukyu seafaring to a 2014 national park and a cave queue.
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How
A shore cave or a Kerama boat, then Yaeyama, not Yonaguni on day one.
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Gear
A suit that matches the month, and sleeves for the cave queue.
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Safety
Swell at the cave, current at the parks, and boats: not a briefing.
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Points
Eight real sites: Kerama, Ishigaki manta, Blue Cave and the chain around them.
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Culture
Cooperatives, park boats, and a cave that became a queue.
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Today
A 2014 park, a crowded cave, and manta codes still being written.
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Frequently asked questions
What is the Blue Cave?
A limestone sea cave at Cape Maeda on Okinawa Island, entered from shore or a short swim, crowded, and overhead-adjacent. It is a snorkel and intro-scuba product, not a cavern course, and not empty at 10 a.m.
Kerama?
A national park (2014) west of Naha, known for clear water, turtles, and boat snorkel/scuba. Zamami is a common gateway island.
Ishigaki manta?
Boat sites such as Manta Scramble / Kabira-area points where manta rays are seen in season. Distance rules apply. Not a first Maeda day.
Yonehara?
A beach and reef on Ishigaki used for snorkelling when conditions allow, a sand-entry contrast to a manta boat.
Miyako / Irabu?
Limestone islands with shore and boat sites, including well-known caves and drops. A different map from Naha.
Yonaguni?
Japan's westernmost inhabited island, famous for a submerged rock formation and strong current. Advanced, remote, optional. This page is not a monument theory essay.
Minna Island?
A small island off the Motobu Peninsula, a day-trip snorkel with a glass-bottom and beach culture.
Live briefing?
No.