The Jinzū River (Jinzū-gawa) is a river that flows from Gifu Prefecture to Toyama Prefecture in Japan. It is called Miya River (Miya-gawa) in Gifu. It is 120 km (120,000 m) in length and has a watershed of 2,720 km2 (1,050 sq mi).
The river flows from Mount Kaore in Gifu and meets the Takahara River at the border between Gifu and Toyama. Then it flows straight to the north and pours into Toyama Bay and the Sea of Japan. It once meandered through the city of Toyama, but the new waterway was constructed in the west of the city to avoid floods. Toyama City Hall and other governments are located on the reclaimed land of the old river.