| 1．Yamakuni River | ||||||
| The Yamakuni River (山国川, Yamakuni-gawa) is a river that flows through the Ōita Prefecture in Japan. In its lower reaches it provides the boundary to the Fukuoka Prefecture to the west. The Yamakuni River arises on the slopes of the sacred Mount Hiko on the border of Oita and Fukuoka prefectures, flowing towards the sea through the Yabakei and Nakatsu plains, and empties into the Seto Inland Sea.[1] Tributaries include the Yamaoi River, Atoda River and Yamautsuri River. | ||||||
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| 2．Ōno River | ||||||
| The Ōno River (大野川, Ōno-gawa) is a river that originates in Ōita Prefecture, Japan. After running through the southern and central portions of Ōita Prefecture, it runs through the eastern part of Kumamoto Prefecture and the northern part of Miyazaki Prefecture. The Hakusui Dam, constructed in 1938, is one of twelve dams located on the river.[2] | ||||||
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