Bokido Cave Onsen located in Wakayama prefecture in the Kansai region of Japan, is an absolute must visit to experience that ultimate Japanese hot spring experience! Bokido Cave Onsen is a hot spring located in a large cave right in front of the Pacific ocean, giving you beautiful relaxing ocean views while the hot spring soothes your mind and body for the ultimate relaxing experience. As part of the Hotel Urashima Spa & Resort, this hot spring hotel is a must-go for this rare experience that you won't find elsewhere!