Agano River
Agano River Taima Bridge 001.JPG
Agano River and Taima Bridge of Ban'etsu West Line
Native name阿賀野川  (Japanese)
Physical characteristics
 • locationMount Arakai, border of Fukushima Prefecture and Tochigi Prefecture
 • elevation1,581 m (5,187 ft)
 • location
Sea of Japan, Niigata Prefecture
 • coordinates
37°57′48″N 139°07′46″E / 37.963224°N 139.129556°E / 37.963224; 139.129556Coordinates: 37°57′48″N 139°07′46″E / 37.963224°N 139.129556°E / 37.963224; 139.129556
 • elevation
0 m (0 ft)
Length210 km (130 mi)
Basin size7,710 km2 (2,980 sq mi)
 • average451 m3/s (15,900 cu ft/s)

The Agano River (阿賀野川, Agano-gawa) is a river in the Hokuriku region of Honshu, Japan. It is also called the Aga River or the Ōkawa River in Fukushima.

The source of the river is Mount Arakai on the border of Fukushima and Tochigi. It flows to the north and meets the Nippashi River from Lake Inawashiro and the Tadami River in the Aizu Basin, and then turns to the west and falls into the Sea of Japan. The Agano River flows for 210 kilometers. It has a watershed area of 7,710 square kilometers.[1]

In 1964–1965, a chemical factory at Kanose village in Niigata Prefecture released methylmercury into the river and caused Niigata Minamata disease.[2]

There are several hydroelectric power plants on the Agano River:


  1. ^ "Agano River". Tourist Link. Retrieved 4 March 2013.[permanent dead link] Archived 3 January 2020
  2. ^ Ceccatelli, Sandra; Aschner, Michael (23 March 2012). Methylmercury and Neurotoxicity. Springer Science & Business Media. p. 5. ISBN 978-1-4614-2382-9.
  3. ^ Simeons, Charles (24 April 2014). Hydro-Power: The Use of Water as an Alternative Source of Energy. Elsevier Science. p. 510. ISBN 978-1-4831-4561-7.