East Asia
Diving in Japan
Mainland Japan is temperate, but its diving reputation is built in the deep south — the Okinawa and Yaeyama island chain, closer to Taiwan than to Tokyo. Ishigaki Island is the hub: warm water, healthy coral, and a cluster of manta cleaning stations that make it a bucket-list ray destination. Remote Yonaguni, the westernmost island in Japan, turns the season on its head with winter schools of scalloped hammerheads in strong Kuroshio current.
What you can see
Manta Rays in Japan High confidence
Well documented, and reliably seen in season.
Best time: May to October, with the best odds in September and early October
Hammerhead Sharks in Japan High confidence
Well documented, and reliably seen in season.
Best time: Winter, December to March
Know before you go
- Best season
- May to October for manta rays; December to March for hammerheads at Yonaguni. Diving runs year-round.
- Conditions
- Subtropical: water around 25–29°C in summer, 21–25°C in winter. A 3mm wetsuit suits summer; 5mm for winter diving.
- Getting there
- Fly to Ishigaki (ISG) via Naha or direct from Tokyo/Osaka. Most manta sites are a 10–20 minute boat ride from Kabira on the northwest coast. Yonaguni is a further short flight or a four-hour ferry from Ishigaki.