Akiyoshido is the largest limestone cave in Japan and one of the longest in East Asia, carved over hundreds of thousands of years beneath the Akiyoshidai plateau in central Yamaguchi. A well-lit walking route of about a kilometre leads through a cool, cavernous underground world: soaring chambers, an underground river, and remarkable formations including the ‘Hundred Plates’, a hillside of terraced limestone pools, and towering columns and draperies. The cave holds a steady temperature around 17°C year-round, making it refreshing in summer and mild in winter. Easily combined with the grassy karst plateau above, it is the natural highlight of inland Yamaguchi and one of the region’s great sights.
🗓️ At a Glance
| Location | Akiyoshi (Mine), Yamaguchi |
| Hours | ~8:30–17:30 (seasonal) |
| Admission | Around ¥1,300 adults |
| Time needed | 1–1.5 hours |
| Best time | Year-round; cool in summer |
What to See
- Japan’s largest limestone cave, cool year-round.
- The ‘Hundred Plates’, a hillside of terraced limestone pools.
- Soaring chambers, an underground river and towering formations.
- Easy combination with the Akiyoshidai karst plateau above.
Combine Your Visit
- Combine with the Akiyoshidai plateau directly above.
- Pair with Takayama Onsen in the same area.
- Read our Yamaguchi overview .
Getting There
- By bus: buses run from Shin-Yamaguchi Station to Akiyoshido.
- By car: the easiest way, with parking at the cave entrance.
Tips
Wear shoes with grip, as the cave path is paved but can be damp and uneven, and bring a light layer even in summer since it stays around 17°C underground. Allow time to climb up to the Akiyoshidai plateau for its grassy karst scenery, which most people combine with the cave, and check seasonal hours before setting out.
