Shizuoka » Hamamatsu , Hamanako
Ryuga-Iwa Cave, located in the Okuhamana Lake area, is known as one of the largest limestone caves in the Tokai region and is beautifully filled with stalactites of various shapes and sizes.
Formed on limestone about 250 million years ago, the cave is about 1,000 meters long (400 meters open to the public) and is located at the southern foot of the 359.1-meter-high Ryugaishi Mountain.
The average annual temperature inside the cave is 18°C, making it cool in summer and warm in winter, so visitors can enjoy exploring the cave comfortably in all four seasons.
The cave is filled with stalactites that look like works of art created by the passage of time, and the underground waterfall with a drop of 30 meters is especially worth seeing.
In the Suijin-sama area, blue lights create a beautiful scene, and in the Phoenix Room, a chandelier of stalactites is spread out. Visitors can experience a healing power spot in this mysterious underground world.
Cave Museum
At the exit of Ryugaiwa Cave, there is the first “cave” themed museum in Japan. The museum exhibits the environment surrounding caves and stalactites, as well as the relationship between humans and caves, in three dimensions through dioramas and real fossils.
9:00-17:00
Open all year round
Adults and high school students: 1,000 yen
Elementary and junior high school students 600 yen
10 minutes by car from Hamamatsu Inazane I.C. on the New Tomei Expressway
30 minutes by car from Hamamatsu Nishi I.C. on the Tomei Expressway
Approximately 30 minutes by car from the Mikkaichi Interchange on the Tomei Expressway