

Best for intermediate divers, Up to 25m, boat entry, strong current.
Uminchu is an artificial reef located off Zamami Island, Japan, featuring a structure that descends to a maximum depth of 25 metres. The site is characterised by strong currents that require careful planning and coordination with surface support teams. Visibility at the site typically ranges between 10 and 30 metres. Due to the nature of the currents, this site is suited for intermediate divers. Access is exclusively by boat, and divers should consult with local operators regarding tidal shifts and current direction before entry. Water temperatures fluctuate between 22 and 29 degrees Celsius throughout the year.
26.18610, 127.34100
The strong current can shift direction with the tide, so check conditions with your boat operator before descending and plan to reef-hook or shelter behind the structure if the flow picks up. Boat entry is the only access, so confirm departure times and availability locally before you travel.
Located about 3 minutes from Aharen port on Tokashiki Island.
Recorded at this site
Depth
Up to 25m
Visibility
10-30m
Skill Level
Intermediate
Entry
Boat
Boat required
Water Temp
22-29°C
Current
Strong
Best Time
Apr, May, Jun, Jul, Aug, Sep, Oct
The artificial reef structure reaches a maximum depth of 25 metres.
No, Uminchu is recommended for intermediate divers due to the presence of strong currents.
Access to this site is by boat only. You must confirm departure times and availability with local boat operators before travelling.
The site experiences strong currents that can shift with the tide. Visibility generally ranges from 10 to 30 metres, and water temperatures vary between 22 and 29 degrees Celsius.
The primary hazard is the strong current. Divers should monitor their position closely and coordinate all boat entries with their surface support team.
Diving at Uminchu in Tokashiki requires the following certifications: Open Water. Always dive within your training limits.
A 3mm wetsuit is recommended for diving at Uminchu in Tokashiki. Water temperatures range from 22°C to 29°C.
The best months to visit Uminchu in Tokashiki are April, May, June, July, August, September, and October. Conditions outside these months can still be good but are less predictable.