Mitsuishi River

Mitsuishi River 三石川
Native name	Mitsuishi-gawa (Japanese)
Location
Country	Japan
State	Hokkaido
Region	Hidaka
District	Hidaka
Municipality	Shinhidaka
Physical characteristics
Source	Mount Setaushi, Hidaka Mountains
• location	Shinhidaka, Hokkaido, Japan
• coordinates	42°25′17″N 142°41′30″E / 42.42139°N 142.69167°E / 42.42139; 142.69167
• elevation	280 m (920 ft)
Mouth	Pacific Ocean
• location	Shinhidaka, Hokkaido, Japan
• coordinates	42°14′40″N 142°34′11″E / 42.24444°N 142.56972°E / 42.24444; 142.56972
• elevation	0 m (0 ft)
Length	31.6 km (19.6 mi)
Basin size	159.4 km2 (61.5 sq mi)

Mitsuishi River (三石川, Mitsuishi-gawa) is a river in Hokkaido, 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).^[1]

The Mitsuishi River originates at Mount Setaushi (859 kilometers (534 mi))^[1] 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.^[1] It then continues until it reaches the Pacific Ocean at Mitsuishi in Shinhidaka, Hokkaido.^[2]

• Pishunbebō River (ピシュンベボウ川, Pishunbebō-gawa) (left)
• Rubetsube River (ルベシベ川, Rubetsube-gawa) (right)
• Bebō River (left)
• Nobushitsu River (延出川, Nobushitsu-gawa) (left)
• Utsuma River (ウツマ川, Utsuma-gawa)　(right)
• Futamata River (二股川, Futamata-gawa) (left)
• Pirashuke River (ピラシュケ川, Pirashuke-gawa) (left)
• Migikyūgō River (右九号川, Migikyūgō-gawa) or Ninth River on the Right (right)

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