Best for beginner divers, 10-25m, boat entry, moderate current.
Benten Island offers a combination of natural reef and artificial reef structures located 500 metres from shore. The site ranges in depth from 10 to 25 metres, with the most notable terrain found in the shallower sections where the two reef types meet. Access is by boat only. Divers should be prepared for moderate currents and visibility averaging 10 metres. Water temperatures fluctuate between 9 and 22 degrees Celsius due to the mixing of the Kuroshio and Oyashio currents, often resulting in thermoclines. Hazards include cold water, entanglement risks near artificial structures, and potential surf. A drysuit or thick wetsuit with a hood is recommended for cooler months.
38.43630, 141.48740
The shore break at the entry point can catch you off guard, so confirm sea conditions with the dive shop before heading out, as the boat operator will likely know the safest approach for the day. Cold water is a real factor in winter and spring, so a drysuit or a thick wetsuit with a hood is worth the extra effort.
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Depth
10-25m
Visibility
10m
Skill Level
Beginner
Entry
Boat
Boat required
Water Temp
9-22°C
Current
Moderate
Yes, the site is suitable for beginners, though solid buoyancy control is required to manage the moderate currents.
The site depth ranges from 10 to 25 metres, with an average depth of 10 metres.
This is a boat dive located 500 metres from the shore.
Temperatures range from 9 to 22 degrees Celsius. The mixing of warm and cold currents can cause variable temperatures and thermoclines.
Divers should watch for cold water, entanglement risks near the artificial reef structures, strong currents, and surf.
Diving at Benten Island in Onagawa Chō requires the following certifications: Open Water. Always dive within your training limits.
A 7mm wetsuit or semi-dry is recommended for diving at Benten Island in Onagawa Chō. Water temperatures range from 9°C to 22°C.
