Genbudo Park

This natural monument within the San’in Kaigan UNESCO Global Geopark was formed nearly 1.6 million years ago by volcanic activity. The park contains five major caves, which feature distinctive columns of basalt rock. Each cave has its own identifiable features. Genbudo cave used to be a quarry; 300 years ago, the basalt rock here was excavated for various purposes including the building of stone walls and river bank protection. In 1931, Genbudo and Seiryudo caves became national Natural Monuments, making them among the most popular sightseeing spots in the area.