御嶽山
In 1917, construction begins on the Ōtaki Forest Railroad (王滝 森林鉄道) The railroad was discontinued on June 30, 1975. On May 1, 1968, Chikuma District was renamed Kiso District. On September 14, 1984 the 1984 Otaki earthquake caused a section of Mount Ontake to crumble and flow into the Ōtaki Valley, with 29 people reported dead or missing and 87 homes destroyed.