Koza Gawa River is a freshwater site in Japan offering shore-entry diving and snorkelling. The riverbed reaches depths of 5 to 10 metres, with an average depth of 4 metres, making it suitable for beginners. Visibility typically ranges from 5 to 10 metres, and mild currents ensure comfortable conditions. The site supports night diving, allowing for exploration after dark. Water temperatures fluctuate significantly throughout the year, ranging from 18C to 28C, though winter temperatures can drop as low as 3.3C. Divers should use appropriate thermal protection. Local facilities include a dive shop providing equipment rental, air fills, and guided tours.

Kushimoto features a combination of natural and artificial reef structures, offering a varied underwater landscape for divers. The site ranges from 5 to 16 metres in depth, with an average of 10 metres, making it suitable for beginners. Visibility fluctuates between 5 and 25 metres, and a moderate current requires careful planning of entries and exits. Divers can access the site from both shore and boat. Facilities on site include parking, toilets, showers, changing rooms, a rinse station, air fills, and equipment rental. Use caution during entry and exit to avoid sharp coral and rocks, and ensure appropriate footwear is worn when crossing rocky areas.

Marine Center Front is a shallow reef site in Japan reaching a maximum depth of 6 metres. This location is suitable for beginners and those practising shore entries. The site features coral formations and a mild current, making it a manageable environment for divers. Entry is via a sloped shore approach; use caution and wear sturdy dive boots to navigate the sharp rock near the water line. Water temperatures fluctuate between 18 and 28 degrees Celsius throughout the year. As facilities are not confirmed on-site, ensure all equipment and support are arranged locally before arrival.

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.

Nakagurumi is a shallow reef site in Japan reaching a maximum depth of 11 metres. The site features a mild current and is suitable for beginner divers looking to build confidence. Divers should be aware that visibility can be variable, and the substrate is prone to silt-out if buoyancy is not maintained. Access is exclusively by boat, requiring coordination with a skipper. As facilities are unconfirmed, divers must bring all necessary equipment on board. Water temperatures fluctuate between 18 and 28 degrees Celsius throughout the year. Divers should monitor their depth closely due to the shallow nature of the reef.

Ando no Hana is a muck dive site located off Shikoku, Japan. The topography consists of sediment and rubble, extending from the shallows to a maximum depth of 27 metres. The site is suitable for intermediate divers who can navigate variable visibility and mild currents while searching the substrate for small, cryptic marine life. Access is by boat, and divers should exercise caution due to surf and shore break conditions at the entry point. Water temperatures range from 18 to 27 degrees Celsius, with drysuits recommended during colder months. Divers should ensure all equipment and air requirements are met prior to departure, as facilities at the site are unconfirmed.

Sumisaki is a reef dive site in Japan suitable for beginner divers. Located 300 metres from shore and accessed by boat, the site features depths ranging from 5 to 18 metres with an average of 12 metres. Divers experience mild currents and visibility between 10 and 20 metres. The site offers facilities including changing rooms, showers, and equipment rental. Water temperatures fluctuate between 18 and 27 degrees Celsius throughout the year, requiring appropriate thermal protection during cooler months. Typical dives last approximately 45 minutes.

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.