One of the largest caves in Western Japan, this limestone cavern is 1.2 km long and features height variations of up to 90 m. After entering the caves through the entrance 240 m up limestone cliffs, visitors can experience what being an explorer is like as they are greeted with spectacular sights such as “Jellyfish Rock” and other rock formations as well as a 50 m tall waterfall. The cavern remains a comfortable temperature of 15–16°C year round. The area surrounding the cave also offers beautiful sights, particularly the autumn foliage of Ikura Gorge reflected on the Takahashi River.