Issou Omiya Mae is a reef dive site located in Japan. Divers access the site from the shore, with the reef situated approximately 50 metres from the entry point. The site features a consistent depth of 13 metres, making it suitable for beginner divers. Conditions at the site vary, with visibility ranging from 5 to 20 metres and mild currents present. Water temperatures fluctuate throughout the year, reaching a high of 29C in August and a low of 20C in February. Typical dives last around 40 minutes. Divers should exercise caution regarding sharp coral present at the site.

Issou Tank No.1 is a marine dive site in Japan accessible only by boat. The site features a consistent depth of approximately 10 metres, making it suitable for beginner divers. Conditions vary throughout the year, with water temperatures ranging from 20C in February to 29C in August. While specific observations at this exact location are limited, species recorded around this area include wrasses, snowflake moray, white-spotted puffer, porcupinefish, and various nudibranch species such as the geometric rainbow dorid and halgerda willeyi. Divers may also encounter sea stars and elongate clams in the surrounding habitat.

Amami & Ogasawara Reef is an offshore marine site in Japan requiring boat access. The reef features a range of depths and is subject to moderate currents that can strengthen, necessitating solid buoyancy control and mid-water positioning skills. Water temperatures fluctuate seasonally, ranging from 20C in February to 29C in August. Due to the offshore location and the potential for strong currents, divers must monitor their position closely and consult local operators regarding current flow before entering the water. Visibility at the site is variable, and divers should arrange air fills and equipment logistics with local providers in advance as on-site facilities are not confirmed.