OKI ISLANDS UNESCO
GLOBAL GEOPARK
Geohistory - Rocks from Volcanic Islands Period
Geosites / Nishinoshima Town
This sea arch was shaped naturally by erosion from the rough waves of the Sea of Japan. It was once the entrance to a sea cave, but landslides caused the back of the cave to collapse and crumble away, leaving the shape we see today.
Quartz Syenite and Hornfels, Ōyama
This rock was formed by magmatic ac…
Tokage-iwa (Lizard Rock) Seen From the Lookout
From here, you can see a strangely-…
Obsidian and Volcanic Vent, Kishihama-tōge Pass
At Kishihama-tōge Pass, the path th…
Columnar Joints and Samizu-no-taki Cliff, Ganya
In this area you can see hexagonal …
