Minabe Syougase is a reef site in Japan requiring boat access. The topography features roots where divers can reach depths of up to 40 metres. At 38 metres, the site hosts giant anemones and anthias, while clownfish are frequently found around the root structures. Conditions are variable, with currents that require advanced diving skills. Due to the significant depths, divers should be mindful of nitrogen narcosis. Water temperatures fluctuate throughout the year, ranging from 17C in the spring to 26C in September. This site offers a challenging environment for experienced divers looking to explore deep reef formations.

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.

Noa Front Beach is a shore-entry reef dive in Japan suitable for beginner divers. The site features depths ranging from 8 to 15 metres with an average of 10 metres. Divers experience mild currents and visibility between 5 and 20 metres. Entry requires caution due to a surf break at the shoreline and sharp coral or rocks on the seabed. The site is equipped with full facilities, including parking, toilets, showers, changing rooms, and a rinse station. Night diving is permitted, and typical dives last approximately 50 minutes. Water temperatures fluctuate throughout the year, ranging from 17C in winter to 28C in autumn.

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.

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.

Koza River Nukumi is a shallow freshwater dive site in Japan, offering a unique environment for divers of all experience levels. Accessed via a shore entry, the site features depths ranging from 2 to 7 metres with an average of 5 metres. Conditions are generally manageable with mild currents, though visibility typically fluctuates between 5 and 8 metres. Water temperatures vary significantly throughout the year, ranging from 18C to 28C, necessitating appropriate thermal protection. The site is equipped with parking, showers, a rinse station, and equipment rental. Night diving is also permitted, providing an opportunity to observe the river environment after dark.

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.

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.