Dogashima Onsen

Dogashima Onsen is a coastal hot spring resort on the rugged western coast of the Izu Peninsula in Shizuoka Prefecture, where siliceous thermal waters from the Izu volcanic system are combined with spectacular Pacific coastal scenery — dramatic sea stacks, sea caves, and eroded volcanic cliffs carved by the Pacific swell — creating one of the Izu Peninsula's most scenic thermal experiences. The Dogashima coast is famous for its natural cave temples (where the ocean has carved sea caves into the volcanic rock that contain small Shinto shrines) and the glass-bottomed boat tours through the marine caves, offering a unique combination of geological and spiritual coastal experience. The Izu Peninsula Geopark status of the surrounding coastline reflects the extraordinary volcanic and tectonic heritage of a peninsula that was once a volcanic island chain colliding with Honshu, and the siliceous onsen of Dogashima represent the geothermal legacy of this dramatic collision of tectonic plates beneath the western Pacific.