Are currents strong around Kohamajima Island?

Not everywhere, but the Yonara Waterway can run faster and is best handled as a guided channel dive.

How do you reach Kohamajima Island?

Most trips start with a ferry from Ishigaki, then use boat access to reach the dive sites.

Is Kohamajima Island crowded?

It is popular, but the spread-out sites and small-group tours keep it from feeling packed.

Is Kohamajima Island good for snorkeling?

Yes, calm shallow reef areas such as Coral Beach work well for snorkeling on settled days.

What facilities support Kohamajima Island dives?

Large resorts, local tour operators, and gear-inclusive boat plans make it easy to organize a dive trip.

What makes Kohamajima Island good for diving?

It mixes easy coral reefs with manta-friendly channel points, so the island suits a range of divers.

What marine life can you see around Kohamajima Island?

Expect manta rays, turtles, eels, scorpionfish, and other tropical reef fish.

When is Kohamajima Island best?

It is a year-round dive area, with spring to early fall especially good for clear water and manta encounters.

Kohamajima Island

Boat-diving island base with coral reefs, manta rays, and clear water.

Scuba DivingSnorkelingBoatIntermediate5m - 30m

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.

Safety & Access

Safety Notes

Channel points can run faster than the calmer reef areas, so follow guide calls and keep neutral buoyancy on manta dives.

Where Is Kohamajima Island?

This spotExplore nearby spots on the map

Community sourced coordinates.

Map imagery © Mapbox

Featured Operators

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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.

Wildlife at Kohamajima Island

Species commonly reported at this site, with direct links into their wildlife guides.

Saltwater Fishes

Eel

Green sea turtle ( Chelonia mydas ), Moorea, French Polynesia

Turtles

Green Turtle

Chelonia mydas

Turtles

Hawksbill Turtle

Eretmochelys imbricata

Rays

Reef Manta Ray

Mobula alfredi

Saltwater Fishes

Scorpionfish

Scorpaenidae

Research Estimate At Kohamajima Island

Conservative baseline from public research. No community dives logged yet.

Avg. Visibility30m

Access4/5 · Simple entry

Coral5/5 · Pristine, vibrant coral

Aquatic Life4/5 · Great variety

Facilities4/5 · Good facilities

Crowd / PopularityModerate

CurrentModerate current

Recent Visits

Japan · Ishigaki and Iriomote

Kohamajima Island

Boat-diving island base with coral reefs, manta rays, and clear water.

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FAQ

Kohamajima Island, Japan - Dive Spot Details & Conditions | DiveJourney