Yamakuni River
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| Yamakuni River | |
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| Native name | 山国川 (Japanese) |
| Location | |
| Island | Kyushu |
| Region | Ōita Prefecture, Fukuoka Prefecture |
| Physical characteristics | |
| Mouth | |
• location | Yoshitomi, Fukuoka, Nakatsu, Ōita |
• coordinates | 33°37′06″N 131°11′10″E / 33.618281°N 131.186234°E |
| Length | 56 km (35 mi)[1] |
| Basin size | 540 km2 (210 sq mi)[1] |
| Discharge | |
| • maximum | 4800 cubic meters/s in 1944[1] |
The Yamakuni River (山国川, Yamakuni-gawa) is a Class 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.
It is known as the largest rapid river in Kyushu, and when torrential rain occurs in the upper reaches, a large amount of rain flows down in a short time, which has the characteristic of causing flooding.
The Yabakei Dam[2] on a tributary, the Yamautsuri River, and Heisei Ozeki Barrage,[3] help control the river system.
The Yabakei Bridge over it, is the longest stone bridge in Japan.[4][5][6][7]
