Tenjin Tunnel

This is a hand-dug tunnel from the Meiji period, piercing the surrounding steep igneous mountain range. It was excavated between 1901 and 1910 by the village headman at the time, using his personal funds, with the aim of reducing the frequent accidents involving people and horses falling over the mountain pass. The northern entrance is composed of andesite to basaltic andesite, while the southern entrance is composed of dacite to rhyolite, showing significant differences in lithology and age over short distances.