Japan's Largest Limestone Cave! Explore the Mysterious Underground Caverns of Akiyoshido in Yamaguchi.
Looking to beat Japan’s lingering summer heat? Head to Akiyoshido for a refreshing and cool getaway! Located in Yamaguchi Prefecture, Akiyoshido is Japan’s largest limestone cave, maintaining a steady year-round temperature of about 17°C. The moment you step inside, a wave of cool air greets you, making you feel as if you’ve entered another world 🌬️
Akiyoshido, located in Mine City, Yamaguchi Prefecture, is Japan’s most iconic and largest limestone cave. Along with Ryūsen-dō in Iwate and Ryūga-dō in Kochi, it is ranked as one of the "Three Great Limestone Caves of Japan." Situated 100 meters beneath Akiyoshidai—Japan’s largest karst plateau—the cave has been designated a Special Natural Monument by the Japanese government.
The 1-kilometer tourist route showcases breathtaking natural wonders, such as the "Hyakumaizara" (Hundred Saucers), which look like stacked plates, and the massive "Ōgon-bashira" (Golden Pillar).
For those seeking a deeper thrill, you can take on the "Adventure Path" 🔦! Using ladders and flashlights, you can explore the labyrinth-like underground space for a truly extraordinary experience 😊!
Core Features and Scale
· Massive Underground Space: While the total length is about 11.2 km, the main tourist trail covers the most spectacular 1 km. The cave reaches widths of up to 200 meters and ceiling heights of 80 meters.
· Constant Comfortable Temperature: The interior stays around 17°C all year, providing warmth in winter and coolness in summer. The walk takes about 40 to 60 minutes.
· Historical Naming: In 1926, during a visit by Emperor Showa (then the Crown Prince), the cave was officially named "Akiyoshido."
Must-See Highlights
· Aotenjo (Blue Ceiling): Near the main entrance, sunlight reflects off the underground river, creating a mysterious pale blue glow.
· Hyakumaizara (Hundred Saucers): Terraced pools formed by limestone deposits. Despite the name, there are actually over 500 small pools resembling stacked plates—Akiyoshido’s most famous sight.
· Ōgon-bashira (Golden Pillar): A magnificent 15-meter-high, 4-meter-wide stalactite pillar with a golden-textured surface.
· Kasazukushi (Umbrella Cluster): Thousands of tiny stalactites hanging from the ceiling, looking like countless umbrellas.
· The King of the Cave & Maria Kannon: Natural stalagmite formations that, over tens of thousands of years, have grown to look like a standing guardian and a statue of Kannon.
Practical Visitor Information
· Opening Hours: March–November: 08:30–17:30 (Closes at 18:30); December–February: 08:30–16:30 (Closes at 17:30)
· Admission: Adults/High Schoolers ¥1,300, Junior High ¥1,050, Elementary ¥700
· Three Entrances: Akiyoshido Main Entrance (most grand), Kurotani Entrance, and the Elevator Entrance (leads directly to the Akiyoshidai Lookout).
· Transportation Option ①: From "JR Shin-Yamaguchi Station," take the Bocho Bus (approx. 45 mins) to the "Akiyoshido" stop. The bus departs from the designated platform at the North Exit. One-way fare is approx. ¥1,170. Buses run about 8–9 times per day (check schedules in advance).
· Transportation Option ②: From "JR Yamaguchi Station," take the Chugoku JR Bus Akiyoshi Line (approx. 55 mins) to the "Akiyoshido" stop. One-way fare is approx. ¥1,230. Buses run about 5–6 times per day (every 2–3 hours). Most JR West passes cover this JR bus route. This route also passes through the Yuda Onsen area, making it very convenient if you are staying there.
Smart Travel Tips:
Budget Choice: If you have a JR Pass, take the train to "Yamaguchi Station" and transfer to the "Chugoku JR Bus" (Total cost: ¥0).
Time-Saving Choice: If you want to avoid transfers and save about 15–20 minutes, take the "Bocho Bus" directly from "Shin-Yamaguchi Station" (Out-of-pocket: ¥1,170).
Come visit Akiyoshido and experience the true artistry of nature for yourself!
Also, for your trip here, we highly recommend using the "Sanyo & San'in Area Pass"!