Kerama Islands Approach

Naha · Okinawa · Japan

The Kerama Islands scatter across the East China Sea thirty kilometres west of Naha, an archipelago of twenty-odd islands surrounded by crystalline water that has earned the descriptor Kerama Blue. Since national park designation in 2014, protection has strengthened an already healthy marine environment, and channel approaches from Naha access some of Japan's finest subtropical reef diving within easy day-trip reach. Visibility is the first thing that strikes any diver descending in Kerama water. Forty metres is common, fifty not unusual. The water has a quality of light transmission making everything appear closer and sharper. Descending through this blue towards a coral reef feels less like diving and more like flying. Sea turtles define the Kerama experience. Green turtles are abundant, grazing on algae-covered rubble and resting in sandy depressions. They are thoroughly habituated to divers, allowing approach within arm's reach. On a typical dive I encountered between three and six individuals, some feeding, some resting, one ascending to breathe in a slow spiral past my position. The coral sections range from dense Acropora gardens in the shallows to soft coral walls in the channels. The diversity reflects a subtropical location where temperate and tropical species overlap. Fields of blue Heliopora coral are a Kerama speciality. The reef architecture creates habitat for a full complement of Indo-Pacific species in numbers reflecting genuine protection. Manta rays transit the channels during summer, attracted by plankton concentrations. Sightings carry the thrill of unexpected encounter. Whitetip reef sharks rest in caves, and occasional hammerheads in deeper channels add pelagic excitement. The practical advantage cannot be overstated for Japan-based divers. World-class visibility, healthy reefs, reliable turtle encounters, and national park protection — all accessible from Naha by morning boat, returned by afternoon tea. It represents perhaps the finest urban-accessible diving in the Asia-Pacific.