The Izu Peninsula is mainland Japan’s most popular scuba diving region, its volcanic underwater terrain washed by the warm Kuroshio Current, which carries subtropical fish and nurtures soft coral gardens surprisingly close to Tokyo. Famous sites include Osezaki on the west coast, whose sheltered bay suits beginners and training while its outer wall drops steeply into Suruga Bay’s depths, and the east coast’s rocky points, with dive shops in the seaside towns running guided boat and shore dives year-round.
🗓️ At a Glance
| Location | Izu Peninsula, Shizuoka |
| Hours | Dive shop hours vary; booking required |
| Admission | Guided dives typically ¥12,000–20,000 (2 dives) |
| Time needed | Half day to full day |
| Best time | Autumn for the warmest, clearest water |
What to Do
- Dive volcanic reefs and soft coral gardens fed by the Kuroshio Current.
- Osezaki’s sheltered bay for beginners and its steep outer wall.
- Subtropical fish life surprisingly close to Tokyo.
- Year-round guided boat and shore dives from seaside towns.
Combine Your Visit
- Combine with Izu Peninsula sightseeing topside.
- Pair with Atami Onsen for a post-dive soak.
- Read our Shizuoka overview .
Getting There
- By train: dive shops cluster in east-coast towns on the JR/Izukyu lines.
- By car: needed for west-coast sites like Osezaki.
Tips
Book with a dive shop in advance and bring your certification card; beginners can try discovery dives in Osezaki’s calm bay, one of Japan’s classic training grounds. Water is warmest and clearest in autumn after the summer plankton settles, and remember to leave a safe interval before flying or driving over Izu’s mountain passes after diving.
