| Shizunai River 静内川 | |
|---|---|
 Takami Dam (November 2006) | |
 | |
| Etymology | Ainu language: Shiputnai — A marsh at the origin of the Ainu or Shuttonai — A marsh with plentiful grapes or Shutnai — A river at the foot of a mountain. |
| Native name | Shizunai-gawa (Japanese) |
| Location | |
| Country | Japan |
| State | Hokkaidō |
| Region | Hidaka Subprefecture |
| District | Hidaka District |
| Municipality | Shinhidaka |
| Physical characteristics | |
| Source confluence | Koikakushushibichari River and Koibokushushibichari River |
| • coordinates | 42°28′22″N 142°45′05″E / 42.47278°N 142.75139°E |
| • elevation | 300 m (980 ft) |
| Mouth | Pacific Ocean |
• coordinates | 42°19′47″N 142°22′05″E / 42.32972°N 142.36806°E |
• elevation | 0 m (0 ft) |
| Length | 69.9 km (43.4 mi) |
| Basin size | 683.4 km2 (263.9 sq mi) |
| Basin features | |
| 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 |
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.