Bikuni Treasure Island in Japan offers a combination of reef and cave topography suitable for beginner divers. The site reaches depths between 5 and 14 metres, with visibility ranging from 10 to 20 metres. Access is by boat only, and divers should expect mild currents. The cave structure presents an overhead environment, requiring careful buoyancy control and awareness of the roof. Divers can explore the reef and cave walls, which support a variety of temperate marine life typical of the region. Due to water temperatures ranging from 6C to 22C, a thick 4-5mm wetsuit is strongly recommended for this year-round cold water site.

Candle Rock is a marine cave site in Japan, accessible only by boat. The topography features a cave structure reaching depths of 20 metres. Divers encounter mild currents, though visibility is variable, making a torch essential for navigation. The site is suitable for beginner divers comfortable with overhead environments. Due to water temperatures ranging from 6 to 22 degrees Celsius, adequate thermal protection such as a drysuit or thick wetsuit with a hood is necessary. The habitat supports a variety of temperate marine life, including various reef fish and invertebrates that inhabit the rock walls and sandy substrate.

Shark Fin is a shore-entry site in Japan featuring a combination of reef and cave topography. The site ranges from 5 to 23 metres in depth, with an average of 10 metres. Divers encounter mild currents and visibility between 5 and 25 metres. The cave structure presents an overhead environment, requiring careful buoyancy control and positioning. The habitat supports various temperate marine life, including reef fish and invertebrates. Given the water temperatures, which range from 6 to 21 degrees Celsius, drysuits are recommended. On-site facilities include parking and toilets, making this a convenient location for beginners to explore the reef and cave features.