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river in Shibetsu,Hokkaido

1．Teshio River
The Teshio River (天塩川, Teshio-gawa) is a river in Hokkaidō, Japan. At 256 kilometres (159 mi), it is the second-longest river on the island (after the Ishikari) and the fourth-longest in the country (after the Shinano, Tone, and Ishikari).[2] A Class A river, the Teshio is the northernmost major river in Japan, and has been designated Hokkaidō Heritage.[2][3][4] Matsuura Takeshirō is said to have come up with the name "Hokkaidō" during his exploration of the river's interior.[5]
Wikipedia  detail