Shimamawari offers a varied underwater terrain featuring reef, wall, and cave formations. Divers can explore depths ranging from 6 to 30 metres, with an average depth of 15 metres. The site is accessible only by boat, and divers should exercise caution regarding surf and shore break during entry and exit. Navigation requires awareness of sharp coral and rocks throughout the reef area. Current is generally mild, though visibility can vary significantly between visits, which impacts the ability to explore the deeper wall and cave sections. This site is suited for intermediate divers.

Shirahama offers a diverse underwater environment featuring a reef, wreck, artificial reef structures, a cave, and a drop-off. Divers can explore these varied topographies at depths ranging from 5 to 16 metres, with an average depth of 12 metres. The site is suitable for beginners, with mild currents and visibility typically between 10 and 20 metres. Entry is possible from both shore and boat, though divers should exercise caution regarding surf and shore breaks when entering from the beach. Facilities include parking, toilets, showers, changing rooms, and equipment rental. Night diving is available, and a full wetsuit is recommended to protect against jellyfish and sharp coral or rocks.

Soshimaoki-1 features a combination of wall and reef topography, descending from 5 to 22 metres with an average depth of 15 metres. Located 5 kilometres offshore, this site requires boat access. Divers encounter moderate currents that can strengthen, necessitating intermediate skill levels. Visibility is variable, ranging from 5 to 25 metres. The site is suitable for night diving, offering a different perspective of the wall and reef structures. Due to unpredictable surf and shore break conditions at the entry point, caution is advised when boarding or disembarking. Water temperatures fluctuate between 17 and 28 degrees Celsius throughout the year, influenced by the Kuroshio Current.

Tanabe is a boat-access reef dive located 500 metres from the shore in Japan. The site features a reef structure with depths ranging from 8 to 19 metres, averaging 12 metres. Divers should be prepared for moderate currents and visibility that fluctuates between 5 and 25 metres. Water temperatures vary seasonally from 17 to 28 degrees Celsius. The reef floor contains sharp coral and rocks, requiring careful buoyancy control to avoid injury and to prevent stirring up sediment. The site is suitable for beginners and offers a typical dive time of 50 minutes. Essential facilities, including equipment rental, air fills, and showers, are available on-site.

The Stella Polaris is a technical wreck dive located off Shikoku, Japan, resting at depths between 40 and 72 metres. This artificial reef structure requires advanced trimix certification and significant deep-water experience due to the extreme bottom profile and regular strong currents. Divers should plan descents around slack water to ensure safety. Visibility typically ranges from 10 to 20 metres. Water temperatures fluctuate between 17 and 24 degrees Celsius throughout the year. Surface conditions require caution due to active boat traffic. Given the depth and environmental factors, this site is strictly for experienced technical divers.

Isuzumi Reef is a boat-access site located in the Shikoku and Chugoku region of Japan. The reef structure extends from the surface to a maximum depth of 17 metres. Divers can expect mild currents throughout the site, making it suitable for beginners. Water temperatures fluctuate seasonally, ranging from 17C in March to 28C in September. As facilities at the site are unconfirmed, divers should arrive prepared with all necessary equipment, including a surface marker buoy and adequate hydration. Always verify current visibility conditions with a local operator prior to departure.

Bizen is a reef site in Japan reaching depths of 20 metres. The site features mild currents, making it suitable for beginner divers, though surface surge and swell require careful monitoring during boat entries and exits. Visibility typically ranges between 10 and 12 metres. The reef structure provides a habitat for a variety of reef fish and invertebrates. Bizen is accessible year-round and is also suitable for night diving. Boat access is required, and guided tours are available through the local dive shop to assist with navigation and locating camouflaged marine life.

Glass World is a reef site in Japan suitable for beginner divers. The reef structure extends from the surface to a maximum depth of 17 metres. Influenced by the Kuroshio Current, the site remains accessible year-round with water temperatures fluctuating between 18 and 28 degrees Celsius. Divers can expect mild currents, though visibility varies significantly depending on local conditions. Access to the site is by boat only. The reef features distinctive shikoro and white corals, providing a habitat for various reef fish and invertebrates. A slow, patient approach around the coral structures is recommended to observe the local marine life.