Kerama Islands (Zamami / Aka area)
Kerama NP, Okinawa · 2-20 m · often 15-25 m · summer popular
A 2014 national park west of Naha. Boat snorkel and scuba, turtles, clarity. Wind is the gate; Zamami is a common gateway.
Darker cells mean a higher score for this topic on that metric.
Accessibility56
Skill ceiling52
Gear load46
Risk44
Seasonality54
Wow factor85
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Quick answers
Which local rescue or training agency should I check first?
Use the local lens: coastguard/federation norms and the shop briefing for that bay — not a blog visibility claim.
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.
These are famous, mapped sites. Wind and season change; shops and the Coast Guard publish the day. Depths are typical published bands, not a live plan.
A Kerama snorkel or a quiet beach is the correct first Okinawa water. The Blue Cave is a crowded optional.
Points
Ishigaki Manta Scramble / Kabira points
Ishigaki, Yaeyama · 8-20 m · often 15-25 m · seasonal manta
Boat sites where manta rays are seen in season. Distance rules, current, no chase. Not a first Maeda hour.
Blue Cave (Cape Maeda)
Onna, Okinawa Island · 3-8 m · variable · summer crowds
A limestone sea cave entered from shore. Overhead-adjacent, crowded, swell-sensitive. A mass product, not a cavern course.
Yonehara Beach
Ishigaki · 1-5 m · variable · calm summer
A sand-and-reef beach snorkel when conditions allow. The classroom contrast to a manta boat.
Miyako / Irabu limestone sites
Miyako Islands · 5-25 m · often 15-25 m · weather windows
Shore and boat caves and drops on a limestone plateau. Guided overhead-adjacent sites; a different map from Naha.
Minna Island
Motobu, Okinawa Island · 1-6 m · variable · summer day trips
A small island day-trip with beach and glass-bottom culture. A gentle main-island option when Maeda is a scrum.
Cape Maeda open-water (outside the cave)
Onna, Okinawa Island · 5-15 m · variable · calm mornings
The same cape's open reef, used for checkout and intro dives. Stairs and swell still rule; the cave is optional.
Yonaguni (including the monument area)
Yonaguni Island · 8-25 m · current, variable · weather windows
A remote western island with strong current and a famous submerged rock formation. Advanced, optional, not a first prefecture dive. This atlas will not adjudicate origin theories.
Tips
- Kerama or Minna before the cave scrum — The park is the classroom.
- Early Maeda or skip the cave — Midday August is a different site.
- Manta distance on Ishigaki — The brief is the point.
- Yonaguni is a second trip — Current and a small airport.
Okinawa is a park boat, a cave queue and a Yaeyama manta. The prefecture is a chain, not one stair.