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Senohama waiting area facility listing with toilets, rest space, water and showers.
Dive Spot Guide•
Senohama Reef
Senohama Reef: an artificial-reef fish habitat off Nishiumi.
Scuba DivingBoat
Artificial ReefReef
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Local operator required
Boat access from the Senohama waiting area makes a local operator the normal way to dive it.
Boat-access box reef on sand with dense fish life, macro nudibranchs and a relaxed loop-and-return profile; more fish habitat than coral site.
About Senohama Reef
Senohama Reef is a boat-access artificial reef off Nishiumi in Ainan, Japan. More than 20 sunk iron boxes rest on a sandy bottom, creating a fish habitat that rewards relaxed loops, macro photography and nudibranch hunting. The box layout makes it easy to build a simple circuit, pause for close inspection and turn the dive around without needing a long swim. It is a site for close-range reef watching rather than big depth or current, so plan it as a calm local boat outing with compact terrain and lots of fish activity.
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Research Estimate At Senohama Reef
Conservative baseline from public research. No community dives logged yet.
AccessSimple entry
CoralHeavily damaged
Aquatic LifeExceptional variety
FacilitiesExcellent facilities
Where Is Senohama Reef?
This spotNearby spots
Community sourced coordinates.
Senohama Reef Planning Details
Depth range, seasonality, and planning context.
Reported Depth
Up to 12m
Depth Note
The listing gives a max depth of 12m and describes more than 20 iron boxes sunk on a sandy bottom.
Best Season
Year-round.
Typical Conditions
Artificial reef of sunk iron boxes on a sandy bottom, with fish concentration and macro-friendly box edges.
Safety & Access At Senohama Reef
Hazards, restrictions, and access requirements.
Safety Notes
Watch your buoyancy around the boxes and keep fins clear of the sandy bottom when stopping for macro.
Access Restrictions
Boat access through the Senohama waiting area is the normal route, and calm days make the boxes easier to work around.
Legal Notes
Follow the boat operator's rules at the Senohama waiting area and any local guidance.
Local Intel For Senohama Reef
Community notes to help plan your visit.
Scuba Diving
Good for relaxed reef loops, buoyancy practice and macro photography around the sunk box structures.
Freediving
Not a freedive target; the site is better suited to scuba loops and close-up viewing.
Snorkeling
Calm-day snorkelling may work over the shallows, but the site is mainly rewarding underwater.
Senohama Reef Dive Conditions Planner
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at Senohama Reef.
Current Snapshot
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🌥️Variable
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Surface / Entry
Wind No data · Tide No data
Sea State
Swell No data · Period unavailable
Visibility Outlook
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Exposure Profile at Senohama Reef
Directional shelter context for incoming swell.
Exposure Note
Hourly forecast data is not available yet.
Recent Logged Visits At Senohama Reef
Community dive logs and visit reports for this site.
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Dive Spot Log Averages At Senohama Reef
Average conditions based on logged dives & visits.
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Senohama Reef Guide - Frequently Asked Questions
Planning answers for access, conditions, timing, and site logistics.
Senohama Reef Guide - Sources and Updates
Last Updated
Research Sources
tosashimizu-geo.jp · Official Tourism
Boat-tour meeting point at the Senohama waiting area with year-round access.
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