Izu Peninsula
Japan · Pacific
A cold-water macro paradise south of Tokyo, the Izu Peninsula hosts volcanic seabeds teeming with nudibranchs, frogfish, and blennies against dramatic drop-offs. Seasonal thermoclines bring nutrients that sustain one of Japan's richest invertebrate communities.
How this reef is doing
ⓘ How we measure thisReef state
Live science signals for this reef are still being gathered.
Coral cover
Fish life
Heat
Fishing
Open to fishing, and the water is busy.
Sources · Global Fishing Watch and reef gravity
What you will see
29 species across the dive sites here
Moray Eel
Seen 23 days ago
at Osezaki
Least concern
Festive Sea Slug
Seen 23 days ago
at Osezaki
Spotted White Sea Slug
Seen 23 days ago
at Osezaki
Black Kite
Seen 1 month ago
at Izu Oceanic Park
Least concern
Blue Rock-Thrush
Seen 1 month ago
at Izu Oceanic Park
Least concern
Cellana nigrolineata
Seen 1 month ago
at Yoda
Red-Clawed Crab
Seen 1 month ago
at Yoda
Brown-Eared Bulbul
Seen 1 month ago
at Izu Oceanic Park
Least concern
Japanese Freshwater Crab
Seen 1 month ago
at Izu Oceanic Park
Least concern
Far Eastern Skink
Seen 1 month ago
at Izu Oceanic Park
Least concern
Monodonta perplexa
Seen 2 months ago
at Kumomi
Ornate Ghost Pipefish
Seen 7 months ago
at Yoda
Least concern
Verconia norba
Seen Apr 2025
at Osezaki
Sakuraeolis gerberina
Seen Mar 2025
at Osezaki
Bat-Wing Seaslug
Seen Jun 2024
at Osezaki
Japanese Flying Squid
Seen Apr 2024
at Kumomi
Least concern
Japanese Spurdog
Seen Apr 2024
at Kumomi
Endangered
Pacific Chub Mackerel
Seen Apr 2024
at Kumomi
Least concern
Skipjack Tuna
Seen Apr 2024
at Kumomi
Least concern
Bigbelly Seahorse
Seen year round
at Yoda
Least concern
Blenny (Fang Blenny)
Seen year round
at Izu Oceanic Park
Least concern
Chromodoris Nudibranch
Seen year round
at Kumomi
Coconut Octopus
Seen year round
at Kumomi
Least concern
Hairy Frogfish
Seen year round
at Osezaki
Least concern
Japanese Wobbegong
Seen year round
at Izu Oceanic Park
Least concern
Nudibranch (Flabellina)
Seen year round
at Osezaki
Painted Frogfish
Seen year round
at Yoda
Least concern
Flamboyant Cuttlefish
Seasonal visitor
at Kumomi
Yellowtail Amberjack
Seasonal visitor
at Izu Oceanic Park
Least concern
Dive sites
Osezaki
hairy frogfish · nudibranch (flabellina) · moray eel · festive sea slug
Yoda
ornate ghost pipefish · bigbelly seahorse · painted frogfish · cellana nigrolineata
Izu Oceanic Park
blenny (fang blenny) · yellowtail amberjack · japanese wobbegong · brown-eared bulbul
Kumomi
flamboyant cuttlefish · chromodoris nudibranch · coconut octopus · pacific chub mackerel