nishiumi.info · Operator
Local Ainan boat-dive support and fish-rich diving context.
Dive Spot Guide•
Koyoko Island
Boat-access coral and cave dive off Ainan, Japan.
Shallow boat entry, coral colonies, and fish schools make Koyoko Island beginner-friendly, but low tide is the safer window when current builds.
About Koyoko Island
Koyoko Island is a boat-accessed dive site in Ainan with coral-covered terrain, dense fish life, and a cave section reached after the safety stop. The shallow entry makes it approachable for newer divers, but the site is tide-sensitive and can tighten up when current builds. Plan the dive with local boat support and a low-tide window if possible.
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Research Estimate At Koyoko Island
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 10m
AccessModerate entry effort
CoralHealthy coral
Aquatic LifeGreat variety
FacilitiesBasic facilities
CurrentModerate current
Where Is Koyoko Island?
Community sourced coordinates.
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Koyoko Island Planning Details
Depth range, seasonality, and planning context.
Reported Depth
5m - 18m
Depth Note
Boat entry begins around 5 m; the site profile reaches about 18 m.
Best Season
Winter is the calmer, clearer window; low tide helps in other seasons.
Typical Conditions
Shallow boat entry with a generally manageable profile; low tide is the safer window because current can strengthen.
Safety & Access At Koyoko Island
Site conditions, restrictions, and access requirements.
Site Conditions
Strong currentOverhead environment
Safety Notes
Keep an eye on tide timing, and treat the cave section with standard overhead caution after the safety stop.
Local Intel For Koyoko Island
Community notes to help plan your visit.
Scuba Diving
Suitable for beginners with a calm shallow start; caves can be explored after the safety stop.
Wildlife at Koyoko Island
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At Koyoko Island
Community dive logs and visit reports for this site.
Dive Spot Log Averages At Koyoko Island
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility10m
Activity
No dive activity logged yet.
