- Higashishōnai, Nishishōnai, Minamishōnai, Asono, Tani, Yufugawa, Yunohira,
Iwakigawa, and
Hasama are
created in Ōita District. Kitayufu, Minamiyufu, and Yunohira...
- as
early as the Edo period. The
Iwaki River Improvement Plan (岩木川改修計画,
Iwakigawa Kaishuu Keikaku) was
officially approved by the Diet of ****an in 1917...