Kinasi Pass

Kinasi Pass is the artery of Mafia Island Marine Park. On the incoming tide, clean ocean water pours through the gap into Chole Bay and the pass becomes a conveyor: divers drift over coral terraces while grouper hold their stations, barracuda and trevally hunt the funneled baitfish, turtles angle across the flow, and ribbontail rays hug the sand below. The coral on the walls stays remarkably intact for a working channel. Timing is everything — the outgoing tide dumps green bay water and is avoided — and on spring tides the ride is quick enough to demand attention. The park's signature dive, in every sense.

The moment you come for: Incoming-tide drift through the marine park's main channel; grouper and hunting jacks

Topography: Channel walls and coral terraces funneling oceanic water into Chole Bay

Current: The main tidal gate of Chole Bay; dived on the incoming tide and planned around slack windows.

Hazards: Strong tidal current and mid-channel boat traffic at the pass mouth.

Permits & rules: Marine-park daily fee applies.

Conservation: Inside the marine park; drift, don't grip — the channel coral takes decades to replace.

Nitrox: Worth it here — profiles sit in the range where enriched air meaningfully extends no-stop time (with the training to use it).