Waii (Antenna) Reef - Japan Diving
Site Overview
Waii Antenna Reef is a vibrant coral reef system off the southern coast of Miyako-jima featuring a dramatic slope descending from eight to twenty-eight metres with exceptional coral coverage throughout. The site takes its name from a distinctive rock formation resembling an antenna that serves as a navigation landmark on the reef. The coral diversity is outstanding with massive table corals forming natural platforms staghorn thickets creating sheltered nurseries and delicate soft corals swaying in the gentle current. Green sea turtles are extremely common at this site with multiple individuals observed on every dive foraging among the coral bommies and resting on the sandy patches between reef structures. The reef supports an abundance of tropical fish including schools of anthias butterflyfish and parrotfish that create constant colour and movement. The gentle slope with minimal current makes it accessible to all certification levels while the depth range provides extended bottom time for photography and observation. The crystal clear Miyako waters ensure excellent visibility allowing divers to fully appreciate the scale and health of the coral formations from a distance. The combination of reliable turtle encounters healthy coral formations and easy conditions makes Waii Antenna Reef one of Miyako's most productive and rewarding dive sites for divers of all experience levels. The site's accessibility by short boat ride from Hirara makes it convenient for multi-dive days with the opportunity to combine the antenna reef experience with Miyako's other exceptional sites including the famous Yabiji system and cave diving destinations.
Dive Briefing
"Descend on the mooring line to the upper reef slope at ten metres and swim along the coral gradient following the slope downward toward the deeper section. Pass the distinctive antenna rock formation at approximately fifteen metres and continue along the slope observing the diverse coral community and foraging sea turtles. The deeper section at twenty-five to twenty-eight metres features scattered coral bommies on sand with garden eels and stingrays. Ascend along the slope conducting your safety stop at five metres on the mooring line. The deeper section at twenty-five to twenty-eight metres features scattered coral bommies on sand with garden eels extending from their burrows and stingrays resting on the sandy substrate. Ascend along the slope conducting your safety stop at five metres on the mooring line observing the shallow reef community and juvenile fish nurseries in the protected shallows before final ascent to the surface. Throughout the dive maintain awareness of your buddy position buoyancy control and depth gauge readings while observing the diverse marine communities and geological formations that make this site a rewarding destination for divers of all experience levels visiting the region during the optimal diving season."
Signature Marine Life
Green sea turtle
Chelonia mydas
Best: March, April, May
Clown anemonefish
Amphiprion ocellaris
Best: January, February, March
Humphead wrasse
Cheilinus undulatus
Best: March, April, May
Mandarin fish
Synchiropus splendidus
Best: April, May, June
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?
Waii Antenna Reef is suitable for all certification levels with the shallow slope accessible to open water divers and the deeper section offering more depth for advanced divers. The site is ideal for families and training dives with gentle conditions and reliable sea turtle encounters. Underwater photographers will appreciate the healthy coral formations and abundant marine life subjects. The easy conditions make it perfect for multi-dive days with comfortable surface intervals. Underwater photographers will appreciate the healthy coral formations and abundant marine life subjects providing both wide-angle and macro opportunities throughout the depth range. The easy conditions make it perfect for multi-dive days with comfortable surface intervals and consistent quality throughout multiple visits during a Miyako diving trip.
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