When lava spilled out here during the Sea of Japan's early phase of expansion, it split into multiple sheets. Small rocks called clinkers and other substances filled the spaces in between to produce a red iron oxide. Erosion then ate away at the stone. The formation gets its name for its resemblance to the mouth of a "shishi," a mythical guardian lion.
- Shin-onsen Town, Mikata County, Hyogo Prefecture
- Shinonsen Town San'in Kaigan Geopark Center 0796-82-5222