Things to do · Destination Guide
From Tateyama shark encounters to Katsuura macro reefs, just beyond Tokyo.
Pick an activity mode to compare signature sites, skill fit, and gear planning notes before you lock your trip.
Ito Diving Service BOMMIE in Tateyama operates a guided boat-only shark spectacle. Katsuura Diving Service runs introductory, shore and boat programs from Ubara, while Namegawa Diving Service coordinates another local fishing-ground dive system. The coast is better understood as several permission-managed local dive zones, not one open shore-entry coastline.
Ito Shark City / Okimae-ne
BOMMIE-guided boat-only banded houndshark and stingray encounter with feeding protocols and stronger summer-current potential.
Nishikawana Ohne
Southern-tip boat site cited by JNTO for large aggregations of beard grunts and occasional schooling rays.
Katsuura Shimura Beach
JNTO-identified shore dive option in the Katsuura circuit; access is through local operators, not assumed public scuba rights.
Katsuura Isomura
Outer-coast boat reef where JNTO notes seasonal pelagic schooling; suitability depends on conditions and certification.
Namegawa Shinbama
Namegawa location noted for nudibranchs and macro diversity; local guide and cooperative access apply.
Hasama underwater shrine
JNTO describes an underwater shrine and local wrasse at Hasama, a distinct managed operation.
Namegawa Kuroiwa
Reef with overhang and cavern-like topography.
Namegawa Maguro-ne
Offshore ridge described as high-current habitat with schooling fish; advanced route check required.
Okinoshima Okino-chinsen
JNTO-described soft-coral-covered wreck habitat; active charter, access and any penetration permissions remain unverified.
Operator Checklist
Conditions Fallback
Avoid