Mitsuishi River
| Mitsuishi River (Mitsuishi-gawa) | |
| 三石川 | |
| River | |
 |
|
| Country | Japan |
|---|---|
| State | Hokkaidō |
| Region | Hidaka |
| District | Hidaka |
| Municipality | Shinhidaka |
| Source | Mount Setaushi, Hidaka Mountains |
| - location | Shinhidaka, Hokkaidō, Japan |
| - elevation | 280 m (919 ft) |
| - coordinates | 42°25′17″N 142°41′30″E / 42.42139°N 142.69167°E |
| Mouth | Pacific Ocean |
| - location | Shinhidaka, Hokkaidō, Japan |
| - elevation | 0 m (0 ft) |
| - coordinates | 42°14′40″N 142°34′11″E / 42.24444°N 142.56972°ECoordinates: 42°14′40″N 142°34′11″E / 42.24444°N 142.56972°E |
| Length | 31.6 km (20 mi) |
| Basin | 159.4 km2 (62 sq mi) |
Mitsuishi River (三石川 Mitsuishi-gawa) is a river in Hokkaidō, Japan. It is 31.6 kilometers (19.6 mi) in length and has a drainage area of 159.4 square kilometers (61.5 sq mi).
The Mitsuishi River originates at Mount Setaushi (859 kilometers (534 mi)) in the Hidaka Mountains and flows roughly south to southwest. The river flows into a reservoir at the Mitsuishi Dam. The Mitsuishi Dam was completed on the river in 1992 to prevent the flow of earth and sand from the Pirashike area (ピラシケ地区 Pirashike-chiku), which is prone to landslides. It then continues until it reaches the Pacific Ocean at Mitsuishi in Shinhidaka, Hokkaidō.
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