hoshinoresorts.com · Operator
Coral richness, all-year activity, and snorkel support.
Dive Spot Guide•
Kohamajima Island
Boat-diving island base with coral reefs, manta rays, and clear water.
Scuba DivingSnorkelingBoatIntermediate
Reef
Local operator required
Boat access and channel points are normally handled through local guides.
Kohamajima sits between Ishigaki and Iriomote, with ferry access, resort bases, coral reefs, and mixed-current dive points.
About Kohamajima Island
Kohamajima Island is a boat-diving base in the Yaeyama Islands, east of Iriomote and a short ferry ride from Ishigaki, with resort access, clear coral reefs, and multiple dive points around the island. The area ranges from calm beginner-friendly coral sites to the Yonara Waterway, where manta rays can gather and channel dives can run faster, so it suits divers who want variety rather than a single hard-edged profile.
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Research Estimate At Kohamajima Island
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 30m
AccessSimple entry
CoralPristine, vibrant coral
Aquatic LifeGreat variety
FacilitiesGood facilities
Crowd / PopularityModerate
CurrentModerate current
Where Is Kohamajima Island?
This spotNearby spots
Community sourced coordinates.
Kohamajima Island Planning Details
Depth range, seasonality, and planning context.
Reported Depth
5m - 30m
Depth Note
Coral Beach is described at 5 to 8 m, while Yonara Channel dives run around 9 to 30 m.
Best Season
Year-round, with spring to early fall especially good.
Typical Conditions
Clear tropical water, coral-rich reef flats, and boat-dived sites across the island; calmer reef areas contrast with faster channel points.
Safety & Access At Kohamajima Island
Hazards, restrictions, and access requirements.
Safety Notes
Channel points can run faster than the calmer reef areas, so follow guide calls and keep neutral buoyancy on manta dives.
Local Intel For Kohamajima Island
Community notes to help plan your visit.
Scuba Diving
Boat diving is the norm, with beginner-friendly coral areas and manta-channel points for more experienced divers.
Snorkeling
Calm shallow coral areas such as Coral Beach are snorkel-friendly on settled days.
Kohamajima Island Dive Conditions Planner
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at Kohamajima Island.
Current Snapshot
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🌥️Variable
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Surface / Entry
Wind No data · Tide No data
Sea State
Swell No data · Period unavailable
Visibility Outlook
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Exposure Profile at Kohamajima Island
Directional shelter context for incoming swell.
Exposure Note
Hourly forecast data is not available yet.
Wildlife at Kohamajima Island
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At Kohamajima Island
Community dive logs and visit reports for this site.
No Dive Logs Yet
Be the first to log a dive at this spot and share your experience!
Dive Spot Log Averages At Kohamajima Island
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility30m
Activity
No dive activity logged yet.
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Kohamajima Island Guide - Frequently Asked Questions
Planning answers for access, conditions, timing, and site logistics.
Kohamajima Island Guide - Sources and Updates
Last Updated
Research Sources
phantomislandtour.ishigaki-tours.com · Operator
Seasonality, visibility, and beginner-to-advanced island dive mix.
www.japan.travel · Official
Kohamajima ferry access and boat-diving norm.
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