Ryusendo Cave

A limestone cave is a cave formed when limestone is eroded by water over a long period of time. Ryusendo, one of the three largest limestone caves in Japan, is a natural limestone cave located at the foot of Mt. Ureira. The total known length of the cave is 4,088 meters, 700 meters of which are open to the public.

The mysterious space created by nature and the lakes formed by water gushing from the limestone caves, underground lakes, are the highlights of the site. Currently, eight underground lakes have been discovered, three of which are currently open to the public. As of now, investigations into the caves are still ongoing, and it is said that it will be some time before the full extent of the cave is known.

In addition, five species of bats live in the cave and can be seen hanging in the passageway at certain times of the year. The "Long Connecting Corridor," a straight passageway, leads to the "bat cave," where bats live, and it is said that the presence of five different species of bats is rare in Japan.

Beyond it, there is the "Spring of Long Life," which is said to prolong one's life by three years if one takes a sip. Visitors can see stalactites of various shapes, including the 10-meter-deep "Dragon Abyss," "Turtle Rock," which resembles the shape of a turtle's shell, and "Moon Palace," which has a fantastic atmosphere. In addition, visitors can view three other underground lakes, including the "First Underground Lake," known as "Dragon Blue.