Connected to mainland Okinawa by the spectacular Kouri Bridge, Kouri Island (古宇利島) is an incredible destination for scuba diving in northern Okinawa.
Above the surface, Kouri is famous for its turquoise water and beautiful island scenery. Underwater, however, there is another world to discover: coral reefs, tropical fish, rocky formations, sea turtles and, if you are lucky, the occasional reef shark.
Whether you are a first-time diver, an Open Water diver or an experienced underwater photographer, Kouri Island offers a variety of diving experiences and marine life encounters.
Why Go Diving in Kouri Island?
Kouri Island offers a surprisingly diverse underwater environment. The different dive sites around the island feature coral reefs, rocky formations, natural passages and areas rich in tropical marine life.
One of the biggest advantages of diving in Kouri is its location in northern Okinawa. The island is easily accessible from the Nakijin and Motobu areas, making it a great destination for a day of diving.
But what really makes Kouri special is the marine life you can encounter beneath the surface.
Diving with Sea Turtles in Kouri Island
If you dream of diving with sea turtles in Okinawa, Kouri Island is definitely worth discovering.
Sea turtle encounters are particularly frequent around the island’s reefs. It is not unusual to encounter turtles during a dive, and sometimes we are lucky enough to see them more than once during the same dive. Turtles can often be seen swimming peacefully above the reef, feeding, or resting in natural rock crevices.
A Respectful, Ethical Approach
While turtle sightings are frequent, we prioritize responsible, zero-impact wildlife observation. We strictly avoid chasing or touching marine life: we maintain a respectful distance with zero physical contact to ensure the animals remain undisturbed in their natural habitat.
Of course, wildlife is unpredictable and no encounter can ever be guaranteed 100%. However, this calm and respectful approach allows divers and underwater photographers to take their time, observe, and photograph these beautiful creatures naturally.
Reef Sharks… Occasionally
Sea turtles are not the only exciting marine-life encounters around Kouri. Reef sharks are also occasionally spotted at some of the dive sites.
These encounters are much less predictable than turtle sightings and depend on the conditions, currents, and marine activity on the day.
When a reef shark appears in the distance, it can be an unforgettable moment. They are simply moving through their natural environment, sometimes passing along the reef before disappearing into the blue. These unexpected encounters are part of what makes diving in Kouri so exciting.
What Marine Life Can You See While Diving Kouri Island?
Marine biodiversity is one of the main reasons to go scuba diving in Okinawa. Depending on the site, season, and conditions, you may encounter:
- Sea Turtles: Mainly Green sea turtles and Hawksbill turtles.
- Wide Variety of Anemonefish: Okinawa’s reefs are home to several clownfish species nesting in their host anemones, including the Clark’s anemonefish, Tomato clownfish, Pink skunk clownfish, and the classic Ocellaris clownfish.
- Reef Sharks: Occasional sightings on sites exposed to currents.
- Tropical Reef Fish: Parrotfish, schooling fusiliers, trevally, groupers, and pufferfish.
- Critters & Macro Life: Moray eels hiding in crevices, octopus, tropical coral reefs, nudibranchs, and small crustaceans for macro photography enthusiasts.
Kouri Island Dive Sites
There is no single type of diving around Kouri Island. The choice of dive site depends on the experience level of the divers, wind, waves, visibility, and sea conditions on the day.
Coral Reefs
The coral reefs are one of the main attractions of Kouri Island diving. Some areas feature beautiful coral formations and offer relaxed, shallower dives where you can take your time exploring, observing marine life, and spotting sea turtles resting on the reef. These sites are particularly enjoyable for beginners and underwater photographers.
Rocky Formations and Underwater Topography
Some areas around Kouri feature more varied underwater terrain, including rocks, crevices, and small swim-throughs. These formations create interesting habitats for marine life and make the dives more dynamic to explore for divers who enjoy looking into cracks for smaller creatures.
Is Kouri Island Good for Beginner Divers?
Yes, absolutely.
Some dive sites around Kouri feature sheltered, shallow conditions that are perfectly suitable for Discover Scuba Diving (DSD) and beginner courses when weather permits.
With a professional instructor, you can gradually learn how to breathe underwater, control your buoyancy, and discover Okinawa’s marine life safely. And seeing a sea turtle on your very first dive is an experience you are unlikely to forget.
Kouri Island Diving for Certified Divers
Open Water and more experienced divers can enjoy a wider choice of sites and underwater environments.
The different formations around Kouri allow divers to experience deeper reefs, rocky terrain, and areas with gentle currents that attract larger marine life, including reef sharks. For underwater photographers, the reefs offer excellent opportunities for both wide-angle and macro photography.
Best Time to Dive Kouri Island
Diving around Kouri Island is possible throughout the year, but conditions change with the seasons:
- Spring (April to June): A pleasant time to dive in northern Okinawa. Water temperatures gradually rise and visibility can be excellent.
- Summer (July to September): Warm water and long sunny days make this a peak season for diving. Trips are planned according to weather and sea conditions during typhoon season.
- Autumn (October to November): An excellent time for diving, with warm water, fewer crowds, and generally pleasant conditions.
- Winter (December to March): Water temperatures drop, but when the temperature hovers around 21°C (70°F), a standard 5mm wetsuit is more than enough to stay warm and comfortable. Calm winter days often offer outstanding underwater clarity.
Water Temperature & Visibility Around Kouri Island
Water Temperature
During summer, water temperatures can reach approximately 28–29°C (82–84°F). In winter, when the temperature drops to around 21°C (70°F), a 5mm wetsuit is completely sufficient for comfortable diving.
Visibility
Okinawa is well known for its clear tropical waters. When conditions are favorable, visibility around Kouri Island can be excellent, often exceeding 20 meters (65 feet). Visibility depends on wind, waves, rainfall, and local currents.
How to Get to Kouri Island
Kouri Island is connected to mainland Okinawa by the famous Kouri Bridge. It is easily accessible by car from the Nakijin and Motobu areas.
The drive across the bridge offers incredible views, with turquoise waters stretching out on both sides. A day in Kouri can easily combine scuba diving, exploring the island, relaxing on the beach, and enjoying local food.
Why Dive With a Local Dive Center in Kouri?
Diving conditions in Okinawa can change quickly. Wind, waves, and visibility determine which dive site will offer the best experience on a given day.
A local dive center knows the sites around Kouri intimately and will adapt the trip based on daily conditions and diver experience levels to ensure a safe, memorable adventure.
Kouri Island Diving FAQ
Can you dive Kouri Island all year round?
Yes. Diving is possible throughout the year in Okinawa.
Can you see sea turtles while diving in Kouri Island?
Yes, sea turtle encounters are frequent on the reefs around Kouri. However, as with all wild animals, sightings can never be guaranteed 100%.
What species of clownfish can you see?
Okinawa’s reefs host several species, including Clark’s anemonefish, Tomato clownfish, Pink skunk clownfish, and Ocellaris clownfish.
Can you see reef sharks in Kouri Island?
Reef sharks are occasionally spotted on certain sites depending on currents and daily sea conditions.
Is Kouri Island suitable for beginner divers?
Yes. Sheltered, shallow sites are available for Discover Scuba Diving and beginner divers.
What wetsuit do I need when the water cools down?
When the water drops to around 21°C (70°F) in winter, a standard 5mm wetsuit is completely sufficient. In summer (28–29°C), a 3mm wetsuit or shorty is ideal.
Discover Kouri Island Diving
Kouri Island is famous for its scenery, but its real magic lies beneath the surface. Pristine coral reefs, sea turtles, a variety of clownfish, tropical marine life, and dynamic topography make every dive in northern Okinawa an unforgettable memory.
