Izu Oceanic Park
Izu Peninsula · Japan
Izu Oceanic Park (IOP) is the peninsula's most established dive facility, pairing a managed beach entry with a structured reef that descends through kelp forests into open volcanic terrain at 25 metres. The site is famous for its reliable blenny population — dozens of species peer from their burrows along the rubble slope — alongside large schools of yellowtail jack that sweep through in winter. A dedicated night-dive platform and lighting rig make IOP one of the best after-dark macro sites in Asia.
Conditions
Depth
3 to 25 m
Open water and up
Current
Usually gentle
Can pick up on the edge
Visibility
6 to 12 m
Clearest in the calm season
Water
13 to 28°C
3mm wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 14 | 13 | 14 | 16 | 18 | 20 | 23 | 25 | 23 | 20 | 17 | 15 |
| Vis (m) | 12 | 12 | 12 | 12 | 10 | 8 | 6 | 5 | 8 | 12 | 12 | 12 |
| Current | Gentle | Gentle | Gentle | Gentle | Moderate | Moderate | Gentle | Still | Gentle | Gentle | Gentle | Gentle |
Your chances of seeing each animal
Brown-Eared Bulbul
Last confirmed Jun 11, 2026 · 22 records
Very likely
Most dives
Blue Rock-Thrush
Last confirmed Jun 26, 2026 · 32 records
Very likely
Most dives
Black Kite
Last confirmed Jun 26, 2026 · 29 records
Very likely
Most dives
Japanese Freshwater Crab
Last confirmed Jun 11, 2026 · 25 records
Very likely
Most dives
Far Eastern Skink
Last confirmed Jun 1, 2026 · 30 records
Likely
About 6 in 10 dives
Blenny (Fang Blenny)
Expected
Known here, not yet in recent logs
Japanese Wobbegong
Expected
Known here, not yet in recent logs
Yellowtail Amberjack
Expected
Known here, not yet in recent logs
Gear