The cave temperature remains stable at 17 degrees Celsius year-round regardless of surface weather.
The Hyakumaizara section features hundreds of terraced, shallow limestone basins created by calcium carbonate deposits.
The cave was formed over millions of years by the dissolution of thick limestone layers deposited in ancient tropical seas.
It is home to several specialized species, including the Akiyoshi-do blind cave beetle.
The subterranean river originates in the Akiyoshidai Plateau and exits through the cave system.
Akiyoshido Cave is Japan’s largest and longest limestone cave, stretching approximately 10 kilometers with one kilometer open to the public. The Kurotani Entrance provides access to the upper reaches of the cave system, specifically leading to the Hyakumaizara (Hundred Plates) limestone formations. The cave maintains a constant internal temperature of approximately 17 degrees Celsius throughout the year. It serves as a designated Special Natural Monument of Japan. The subterranean river flows through the karst landscape, which is part of the Akiyoshidai Quasi-National Park. Visitors traverse a well-maintained walking path that features underground waterfalls and diverse karst geological structures. The cave serves as an active drainage system for the Akiyoshidai plateau above.
The Hyakumaizara (Hundred Plates) terrace formations near the Kurotani entrance.
Wear comfortable, non-slip walking shoes as the limestone floor can be damp and slick.
Bring a light jacket if you are sensitive to cold, as the cave remains chilly even in summer.
Start at the Kurotani Entrance if you prefer to walk primarily downhill through the cave.
Do not attempt to explore beyond the fenced-off areas or enter restricted side passages.
Stay strictly on the designated path; touching cave formations is prohibited to prevent damage.
