 The Sai River in Nagano should not be confused with the Sai River (Gifu) even though both rivers have the same "kanji" and reading, 犀川 (Saigawa).Other important rivers include the Susobana River, which originates in the Togakushi highland area; and the Torii River, which also originates in the Togakushi highland area.The Chikuma River is 367.0km, with 29.5 km within the Nagano city limits; the Sai River is 157.7 km, with 44.2 km in Nagano; all 40.1 km of Susobana River are in Nagano City, and 10.4 km of the 34.8 km-long Torii River are in Nagano Myōkō-Togakushi Renzan National Park, Jōshin'etsu-kōgen National Park and Chūbu-Sangaku National Park are each partially located within Nagano City.