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 / 43.02806°N 142.68444°E / 43.02806; 142.68444
• elevation	740 m (2,430 ft)
Mouth	Pacific Ocean
• location	Mukawa, Hokkaido, Japan
• coordinates	42°33′45″N 141°55′1″E / 42.56250°N 141.91694°E / 42.56250; 141.91694
• 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)

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.

The Mu River rises on the slopes of Mount Karifuri in the Hidaka Mountains.^[1] It flows south and west until it reaches the Pacific Ocean at Mukawa.

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

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