Osezaki
Also known as: The Bay, The Cape, The Open Sea
Best time to dive
January to December; November to March
What you might see
- Eagle rayLikely
- FrogfishLikely
- Ghost pipefishLikely
- Hammerhead sharkPossible
- Manta rayPossible
- Mola mola (oceanic sunfish)Possible
- NudibranchLikely
- Sea turtlePossible
- Whale sharkPossible
Sightings are seasonal probabilities, not promises - even in peak season nature does its own thing.
Certification & difficulty
Advanced Open Water - advanced conditions (currents/depth); dive within your training.
Snorkelling
Snorkel-friendly - yes - snorkeling courses/tours are offered at Osezaki
Safety notes
typhoon closures, current at Hotokeiwa and Cape, tidal awareness needed for Sentan/Cape entry, boat traffic in Open Sea areas
Permits & fees
Sentan ('The Cape') requires a 100 yen entry fee, only open on weekends and public holidays
Permits and operators change - confirm before booking.
Location
Nearest hub: Numazu
This profile is desk research, compiled from public sources - not a first-hand dive report. Coordinates are approximate.