This “Hashiriyu”, as one of the three oldest hot spring sources in Japan, is in the style of a cave tunnel, especially unusual throughout Japan.  
Discovered about1,300 years ago, water gushes forth from the mountain and runs towards the coast. The cave has a depth of 5m from the mouth of the tunnel, and each day around 7,000 tons of 70 degree hot water spurts out. 
Passed on as the mouth of a dragon, it is believed to be a water god.  From ancient times, people have purified themselves at the source and paid homage at the shrine.
Be sure to check out this mysterious and spiritual place with your own eyes.  While you cannot bathe in the waters of Hashiriyu, you can enjoy small footbaths drawn from the hot springs; relax and take in pleasant views of the ocean.