travel.rakuten.com · Travel Editorial
Travel guide with depth range, guide requirement, and strong-current context.
Dive Spot Guide•
Yonaguni Monument/ Underwater Ruins
Boat-access underwater monument off the south coast of Yonaguni.
Guide-led drift dive with boat access, stepped rock formations, and a demanding current profile.
About Yonaguni Monument/ Underwater Ruins
Yonaguni Monument/ Underwater Ruins is a boat-access underwater rock formation off the south coast of Yonaguni Island. The site is famous for its stepped, monument-like shapes and the long-running debate over whether those forms are natural or man-made. Dives are typically current-driven, so local guides and solid buoyancy control matter more than a casual sightseeing approach.
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Research Estimate At Yonaguni Monument/ Underwater Ruins
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 30m
AccessChallenging entry effort
CoralHeavily damaged
Aquatic LifeGreat variety
FacilitiesBasic facilities
Crowd / PopularityFew visitors
CurrentStrong current
SurgeLight surge
Where Is Yonaguni Monument/ Underwater Ruins?
This spotNearby spotsExplore nearby spots on the map
Community sourced coordinates.
Yonaguni Monument/ Underwater Ruins Planning Details
Depth range, seasonality, and planning context.
Reported Depth
10m - 25m
Depth Note
The monument is commonly described as lying roughly 10 to 25 m below sea level.
Best Season
November through April for hammerheads; warmer months for the monument and cave formations.
Typical Conditions
Guide-led drift dives in clear water with strong currents and rapid condition changes.
Safety & Access At Yonaguni Monument/ Underwater Ruins
Hazards, restrictions, and access requirements.
Key Hazards
Boat trafficRestricted accessStrong current
Safety Notes
Use a licensed guide, monitor buoyancy carefully, and expect a deep drift dive with changing current.
Access Restrictions
Boat access only, usually with a local guide; strong currents and depth make this a planning-heavy dive.
Legal Notes
Check conditions with a licensed operator and respect site limits, since currents and depth can change rapidly.
Local Intel For Yonaguni Monument/ Underwater Ruins
Community notes to help plan your visit.
Scuba Diving
Boat-entry drift diving around a megalithic rock formation, typically guided and current-aware.
Freediving
Not a practical freedive site because the monument is deep and current-driven.
Snorkeling
Not a snorkeling site; the monument is explored by scuba or from sightseeing boats.
Recent Logged Visits At Yonaguni Monument/ Underwater Ruins
Community dive logs and visit reports for this site.
Dive Spot Log Averages At Yonaguni Monument/ Underwater Ruins
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility30m
Activity
No dive activity logged yet.
