About Mikomoto Island

Destination: Numazu, Shizuoka

Dive Site: Osezaki

Overview: Sheltered on the inner shores of Suruga Bay—Japan’s deepest oceanic trench—Osezaki is celebrated globally as mainland Japan’s premier macro diving capital. The tranquil, protected inner bay provides aquarium-calm conditions ideal for critter hunting, muck diving, and slow-paced macro photography, while the outer reefs slope into dramatic drop-offs and expansive white-sand plains. From bizarre anglerfish and delicate nudibranchs to mysterious oceanic wanderers rising from the abyss, Osezaki pairs unmatched marine biodiversity with the unforgettable sight of Mt. Fuji rising across the bay upon surfacing.

How to get there

Bullet Trains:

To get to Osezaki from Tokyo Station, take the JR Tokaido bullet train to Atami Station (40–50 minutes), then transfer to the JR Ito Line toward Ito Station. Arrive at Izunagaoka Station (10–15 minutes). Pre-arrange a pick-up from Osezaki staff (approximately 30 minutes). Total cost: ¥2,000–¥3,000.

Diving shop

Diving with Osekan

Experience diving with a view of Mt. Fuji at Osekan! There are three dive points in the area:

The Bay: Protected from winds and currents, this site offers relaxing macro diving, ranging from mushy diving to rocky bottom dives. Night diving is available on Wednesday, Saturday, and Sunday.

The Outside Ocean: Often closed due to weather, but if conditions allow, you’ll experience dynamic diving, from pristine white sand areas to the deep rocky terrain.

Sentan: Open only on weekends, this beach dive features colorful Anthias and a beautiful soft coral forest.

Rentals are limited, so please request in advance or bring your own gear.

Free Pick-Up & Drop-Off Service

For Activities Activities JActivities JALPAK plan divers, a free pick-up service is available from Izunagaoka Station.

Taxis are limited and cannot be pre-booked, so avoid arranging your own transport from the station.