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| 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. | ||||||
| Source: Koikakushushibichari River and Koibokushushibichari River | ||||||
| Mouth: Pacific Ocean | ||||||
| Length: 69.9 km (43.4 mi) | ||||||
| Basin size: 683.4 km2 (263.9 sq mi) | ||||||