Yonaguni Monument
Also known as: Underwater Ruins, Kaitei Iseki
Best time to dive
December to March; November to May
What you might see
- BarracudaLikely
- Bull sharkPossible
- Dogtooth tunaLikely
- Flamboyant cuttlefishLikely
- Hammerhead sharkLikely
- Tiger sharkPossible
- 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
Not a snorkel site - no - not offered/documented for this site due to depth and strong current; historical freediving has occurred (Jacques Mayol) but not a commercial snorkel product
Safety notes
strong currents, remote/open-ocean conditions, deep terraces, winter winds/rough seas limiting access, requirement for advanced self-sufficiency, long travel logistics
Permits & fees
no specific national park or dive-site permit fee documented; standard per-dive/trip fees apply (e.g. one operator quotes ~¥8,000 for one dive, ~¥27,000 for a trial dive at the Monument site)
Permits and operators change - confirm before booking.
Location
Nearest hub: Kubura
This profile is desk research, compiled from public sources - not a first-hand dive report. Coordinates are approximate.