Mu River (Hokkaidō)

Mu River (鵡川, Mu-kawa) is a river in Hokkaido, Japan. Located in Kamikawa and Iburi subprefectures, it is one of 13 Class A rivers on the island.

Mu River 鵡川
Red and Blue Boulder Gorge (赤岩青巌峡, Aka-iwa-sei-gan-kyō) in Shimukappu (July 2000)
Native name	Mu-kawa (Japanese)
Location
Country	Japan
State	Hokkaido
Region	Iburi, Kamikawa
District	Yūfutsu
Municipalities	Mukawa, Shimukappu
Physical characteristics
Source	Mount Karifuri
• location	Shimukappu, Hokkaido, Japan
• coordinates	43°1′41″N 142°41′4″E
• elevation	740 m (2,430 ft)
Mouth	Pacific Ocean
• location	Mukawa, Hokkaido, Japan
• coordinates	42°33′45″N 141°55′1″E
• elevation	0 m (0 ft)
Length	135 km (84 mi)
Basin size	1,270 km2 (490 sq mi)
Discharge
• average	50.44 m3/s (1,781 cu ft/s)

Course

The Mu River rises on the slopes of Mount Karifuri in the Hidaka Mountains. It flows south and west until it reaches the Pacific Ocean at Mukawa.

Dams

Class 1 river name	Class 2 river name	Name	Height (m)	Water storage capacity (per 1000 m3)	Type	Operator
Mu River	Soshubetsu River	Soshubetsu Dam	29.0	1,330	Concrete	Hokkaido Electric Power Company
Mu River	Hobetsu River	Hobetsu Dam	38.2	10,330	Rockfill	Hokkaido Regional Development Bureau

Tributaries

Shimukappu (upper reaches):

• Horoka Tomamu River
• Soshubetsu River
• Pankeshuru River
• Shimu River

Mukawa (lower reaches):

• Ososukenai River
• Tosano River
• Horosaru River
• Hobetsu River
• Rubeshibe River
• Kinausu River
• Inaeppusawa River
• Niwan River
• Yunosawa River
• Chin River