

Best for intermediate divers, 9-35m, boat entry, moderate current.
Mill Channel: Ridge is a drift dive site in Yap featuring a combination of natural reef and artificial reef structures. The site topography spans from a shallow reef top at 9 metres down to a slope reaching 35 metres, with an average depth of 20 metres. Divers experience moderate currents that shift with the tide, necessitating boat access and careful planning with local operators. Visibility typically ranges between 10 and 30 metres. Due to the presence of sharks and the nature of the drift, this site is suited for intermediate divers comfortable with current. Always carry a surface marker buoy during your 45-minute dive.
9.60446, 138.12704
Take shelter behind coral formations at Manta Ridge to observe mantas at the cleaning station.
Boat 15 mins
Recorded at this site
Depth
9-35m
Visibility
10-30m
Skill Level
Intermediate
Entry
Boat
Boat required
Water Temp
28-30°C
Current
Moderate
Typical Dive
45 min
Best Time
Jan, Feb, Mar, Apr, Dec
Sharks are a known presence at this site.
While an Open Water certification is the minimum requirement, the site is best suited for intermediate divers who are comfortable managing moderate drift conditions.
The site ranges from 9 metres at the reef top to 35 metres along the ridge slope, with an average depth of 20 metres.
Boat access is required for this site.
The site is used for both diving and snorkelling, though it is primarily a drift system.
Diving at Mill Channel: Ridge in Colonia requires the following certifications: Open Water. Always dive within your training limits.
Yes, equipment rental is available at or near Mill Channel: Ridge in Colonia. Contact local dive operators for specific gear availability and prices.
A rashguard or 2mm shorty is recommended for diving at Mill Channel: Ridge in Colonia. Water temperatures range from 28°C to 30°C.
The best months to visit Mill Channel: Ridge in Colonia are January, February, March, April, and December. Conditions outside these months can still be good but are less predictable.
Divers at Mill Channel: Ridge in Colonia should be aware of sharks. These encounters are generally rare and avoidable with proper awareness. Follow local safety guidance and maintain a respectful distance from all marine life.
Expect moderate currents at Mill Channel: Ridge in Colonia. Good buoyancy control and some drift diving experience is helpful.
Visibility at Mill Channel: Ridge in Colonia typically ranges from 10 metres to 30 metres. Conditions vary with weather, tides, and seasons.