Osezaki
Japan · Pacific
Osezaki sits at the western tip of Suruga Bay in Shizuoka Prefecture where the bay's deep cold-water upwelling collides with a rugged volcanic wall, producing one of Japan's most spectacular pelagic and reef experiences. Massive schools of fusiliers wheel in the blue water above the wall while whitetip reef sharks rest motionless on sand ledges below 20 metres. Soft corals drape the vertical rock face in orange and purple, and the nutrient-rich current draws regular visits from hammerhead sharks and open-water tuna. Shore entry and resident dive services make this one of Japan's most accessible big-animal sites.
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
33 species across the dive sites here
Red Lionfish
Seen 23 days ago
at Shark Ledge
Least concern
Japanese Angelfish
Seen 9 months ago
at Fusilier Reef
Least concern
Nudibranchs (mixed species)
Seen Jan 2025
at The Wall
Hammerhead Shark
Seen Jun 2024
at Deep Pinnacle
Critically endangered
Amberjack
Seen year round
at Deep Pinnacle
Least concern
Black Coral
Seen year round
at Deep Pinnacle
Blue-spotted Grouper
Seen year round
at Shark Ledge
Least concern
Devil Scorpionfish
Seen year round
at Shark Ledge
Least concern
Encrusting Sponge
Seen year round
at Fusilier Reef
Feather Star
Seen year round
at Shark Ledge
Feather Star (Crinoid)
Seen year round
at The Wall
Giant Grouper
Seen year round
at The Wall
Giant Moray Eel
Seen year round
at Shark Ledge
Least concern
Giant Pacific Octopus
Seen year round
at Fusilier Reef
Least concern
Gorgonian Sea Fan
Seen year round
at Deep Pinnacle
Near threatened
Honeycomb Moray
Seen year round
at The Wall
Least concern
Orange Soft Coral
Seen year round
at The Wall
Purple Soft Coral
Seen year round
at The Wall
Scorpionfish
Seen year round
at Deep Pinnacle
Least concern
Sea Fan
Seen year round
at Fusilier Reef
Whitetip Reef Shark
Seen year round
at Shark Ledge
Vulnerable
Yellowtail Fusilier
Seen year round
at The Wall
Least concern
Banded Sea Krait
Seasonal visitor
at Shark Ledge
Least concern
Bigeye Trevally
Seasonal visitor
at Fusilier Reef
Least concern
Bluefin Trevally
Seasonal visitor
at The Wall
Least concern
Deep Sea Anglerfish
Seasonal visitor
at Deep Pinnacle
Least concern
Greater Amberjack
Seasonal visitor
at Fusilier Reef
Least concern
Japanese Jack
Seasonal visitor
at Fusilier Reef
Least concern
Japanese Spiny Lobster
Seasonal visitor
at The Wall
Spotted Eagle Ray
Seasonal visitor
at Shark Ledge
Endangered
Striped Bonito
Seasonal visitor
at Deep Pinnacle
Least concern
Whitespot Anemone
Seasonal visitor
at The Wall
Yellowfin Tuna
Seasonal visitor
at Fusilier Reef
Least concern
Dive sites
The Wall
yellowtail fusilier · giant grouper · honeycomb moray · orange soft coral
Shark Ledge
whitetip reef shark · banded sea krait · red lionfish · devil scorpionfish
Fusilier Reef
yellowtail fusilier · yellowfin tuna · greater amberjack · giant pacific octopus
Deep Pinnacle
amberjack · striped bonito · hammerhead shark · black coral