Tokachi River

Last updated
Tokachi River
Tokachi-gawa, Tokapci
Iwamatsu Dam in Shimizu (September 2007)
Tokachi River
Japan natural location map with side map of the Ryukyu Islands.jpg
Red pog.svg
Native name
Country Japan
State Hokkaidō
Region Tokachi
District Kamikawa, Nakagawa
Municipalities Shintoku, Toyokoro
Physical characteristics
  location Shintoku, Hokkaidō, Japan
Mouth Pacific Ocean
Toyokoro, Hokkaidō, Japan
42°41′42″N143°39′58″E / 42.6950°N 143.6661°E / 42.6950; 143.6661
0 m (0 ft)
Length156 km (97 mi) [1]
Basin size9,010 km2 (3,480 sq mi) [1]
  average71 m3/s (2,500 cu ft/s)
Basin features
Population340,000 [1]

Tokachi River (十勝川, Tokachi-gawa) is a river in Hokkaidō, Japan.


In 1820, the explorer Takeshiro Matsuura (松浦 武四郎) proposed "Tokachi" as the name of the surrounding Tokachi Province, with each character corresponding to a Japanese homophone. The province was named after this river, which in turn was derived from the Ainu language word "tokapci" (トカㇷ゚チ).

Although the exact origins of "tokapci" were unknown, Hidezo Yamada, an Ainu language researcher, proposed these origins:

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  1. 1 2 3 日本の川 - 北海道 - 十勝川 [Rivers of Japan - Hokkaidō - Tokachi River] (in Japanese). Water Management and Land Conservation Bureau, Ministry of Land, Infrastructure, Transport and Tourism. Archived from the original on 10 February 2024. Retrieved 10 February 2024.