Shizunai River
| Shizunai River (Shizunai-gawa) | |
| 静内川 | |
| River | |
 Takami Dam (November 2006)
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Name origin: Ainu language: Shiputnai — A marsh at the origin of the Ainu or Shuttonai — A marsh with lots of grapes or Shutnai — A river at the foot of a mountain. |
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| Country | Japan |
|---|---|
| State | Hokkaidō |
| Region | Hidaka Subprefecture |
| District | Hidaka District |
| Municipality | Shinhidaka |
| Tributaries | |
| - left | Hidaka Mena River (日高目名川 Hidaka Mena-gawa), Mount Sumi River (炭山 Sumi-yama-kawa), Shunbetsu River, Penkeonikemushi River, Ponpanbetsu Creek, Penkebetsusawa River, Porokaunnai River |
| - right | Perari River, Poyoppusawa River, Pisenaisawa River, Ibetsusawa River, Abeunnai River |
| Source confluence | Koikakushushibichari River and Koibokushushibichari River |
| - elevation | 300 m (984 ft) |
| - coordinates | 42°28′22″N 142°45′05″E / 42.47278°N 142.75139°E |
| Mouth | Pacific Ocean |
| - elevation | 0 m (0 ft) |
| - coordinates | 42°19′47″N 142°22′05″E / 42.32972°N 142.36806°ECoordinates: 42°19′47″N 142°22′05″E / 42.32972°N 142.36806°E |
| Length | 69.9 km (43 mi) |
| Basin | 683.4 km2 (264 sq mi) |
Shizunai River (静内川 Shizunai-gawa) is a river in Shinhidaka, Hokkaidō, Japan. The Shizunai River drains from the Hidaka Mountains into the Pacific Ocean.
The Shizunai River was known as Shibuchari and Shibechari. This name was derived from Shipe-ichan, meaning "a salmon spawning place" in Ainu.
The name Shizunai is derived from the Ainu language and has three possible sources:
The Shizunai River flows generally southwest from its headwaters in the Hidaka mountains at the confluence of the Koikakushushibichari and Koibokushushibichari rivers. It flows into Lake Takami (高見湖 Takami-ko), a reservoir created by the Takami Dam. Past the dam, the Shizunai river flows into Shizunai Flood Control Reservoir (静内調整池 Shizunai Chōseichi). Past the Shizunai Dam, the river encounters Futa Dam before leaving the mountains for the flood plain. The river flows past the outlying communities of Shizunai before entering the Pacific Ocean just northwest of Shizunai harbor.
The Shizunai River was designated as a wildlife protection area in 1965. Whooper swans overwinter on the Shizunai River.
The Shizunai River basin was the home of Shakushain the Ainu leader who led a revolt against the Japanese especially the Matsumae clan in the 1660s. In the Edo period the region was used for gold mining.
From river mouth to source:
From river mouth to source:
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