Ishibashi Hantabaru - Japan Diving
Site Overview
Ishibashi Hantabaru is a stunning coral reef system in the Kerama Islands featuring dramatic coral-covered pinnacles rising from deep sand at thirty metres to shallow bommies at five metres depth. The site is renowned for its exceptional coral health and diversity with massive table corals staghorn thickets and delicate gorgonian fans creating an underwater garden of extraordinary beauty. Green sea turtles are commonly observed resting on the coral bommies and foraging among the reef structures while whitetip reef sharks patrol the deeper sand channels between the pinnacles. The clear Kerama waters consistently provide visibility exceeding twenty-five metres allowing divers to appreciate the full scale of the reef formations. The varied topography creates diverse microhabitats supporting hundreds of tropical fish species from tiny pygmy seahorses hiding in gorgonian fans to schooling jacks and barracuda in the blue water column. The site offers both shallow reef exploration for beginners on the upper bommies and deeper wall diving for advanced divers along the pinnacle drop-offs. The combination of pristine coral health diverse marine life and spectacular visibility makes Ishibashi Hantabaru one of the Kerama Islands' premier dive destinations. The combination of pristine coral health diverse marine life and spectacular visibility makes Ishibashi Hantabaru one of the Kerama Islands' premier dive destinations for underwater photographers and nature enthusiasts. The site's accessibility by short boat ride from Zamami Village makes it convenient for multi-dive days with comfortable surface intervals and excellent conditions throughout the Okinawa diving season.
Dive Briefing
"Descend on the mooring line to the upper bommie at ten to fifteen metres and orient toward the main pinnacle formation. Swim along the coral-covered slope observing the diverse reef community including resting green sea turtles on the bommies and schooling fish in the water column. Descend along the pinnacle wall to the sand channel at twenty-five to thirty metres observing the transition from hard coral garden to deep sand habitat. Explore the sand channel for garden eels and stingrays before ascending along the pinnacle for a safety stop at five metres. Explore the sand channel for garden eels and stingrays before ascending along the pinnacle for a safety stop at five metres observing the shallow reef community and juvenile fish nurseries. The upper bommies at five to ten metres provide the most vibrant coral colours and are ideal for extended shallow diving with abundant tropical fish and excellent natural light conditions."
Signature Marine Life
Green sea turtle
Chelonia mydas
Best: March, April, May
Clown anemonefish
Amphiprion ocellaris
Best: January, February, March
Whitetip reef shark
Triaenodon obesus
Best: April, May, June
Humphead wrasse
Cheilinus undulatus
Best: March, April, May
Giant moray eel
Gymnothorax javanicus
Best: January, February, March
Safety & Hazards
- Strong Kuroshio Current influence creating unpredictable drift conditions on outer reef dives
- Boat traffic from dive boats fishing vessels and glass-bottom tour boats in popular coastal areas
- Seasonal typhoon activity from July through October requiring constant weather monitoring and trip flexibility
- Venomous stonefish and sea snakes present on reefs requiring careful buoyancy and no-touch policies
- Coral contact risk on shallow reef dives requiring excellent buoyancy control to protect fragile formations
Traveler Notes
Who is this for?
Ishibashi Hantabaru is suitable for all certification levels with shallow bommies for beginners and deeper walls for advanced divers. Underwater photographers will find exceptional wide-angle and macro subjects among the diverse coral formations and marine life. The site is ideal for nature enthusiasts seeking pristine coral reef ecosystems with reliable sea turtle encounters. Snorkellers can enjoy the shallow bommies from the surface while certified divers explore the deeper pinnacle formations. The site is ideal for nature enthusiasts seeking pristine coral reef ecosystems with reliable sea turtle encounters throughout the year. Snorkellers can enjoy the shallow bommies from the surface while certified divers explore the deeper pinnacle formations creating opportunities for mixed groups with different certification levels.
Quick Stats
Dive Logistics
- Bluefield Yomitan
- Diving Service Uminchu
- Kerama Divers
- Pirania Divers Okinawa
- Sea Serpent Dive Center
Photography Info
Best for: wide_angle
Nearby Stay
Hotel Gracery Naha
Naha, Okinawa • 5km away
Ryukyu Hotel & Resort Nashiro Beach
Itoman, Okinawa • 10km away