The Nen River or Nenjiang (), or Nonni () is a river in
. The Nen River flows through the northern part of
Heilongjiang (; formerly romanized as Heilungkiang) is a province
A province is almost always an administrative division within a country or state. The term derives from the ancient Roman '' provincia'', which was the major territorial an ...
Province and the northeastern section of
Inner Mongolia or Nei Mongol (; ''Öbür Monggol'', /ɵwɵr mɔŋɢɔɮ/, Mongolian Cyrillic: Өвөр Монгол), officially the Inner Mongolia Autonomous Region, is a landlocked and Mongolic autonomous region
An autonomous adminis ...
, some parts of the river forming the border between the two regions. At 1370 kilometres (850 mi) in length, the Nen River is the longest tributary of the Songhua River
The Nen River flows in the general southern direction in a wide valley between the Greater Khingan
and the Lesser Khingan
mountain ranges in the west and east, respectively, and meets the Second Songhua River
to form the Songhua River .
The river is prone to flooding, as occurred most recently in 1998 and 2005.
Major tributaries of the Nen River include:
* Gan River
* Nemor River
* Nuomin River (诺敏河) (Right)
* Wuyuer (乌裕尔河)/Nuyur River (Left)
* Yalu River (Nonni River tributary), Yalu River (雅鲁河) (Right)
* Chuoer River (Right)
* Taoer/Chaor River (洮儿河) (Right)
* Huolin River (霍林河) (Right)
* Nenjiang City, Nenjiang (Mergen), named after the river
*Jiangqiao Mongol Ethnic Town, Jiangqiao
During the Qing Dynasty the Nenjiang provided an important communication route between southern Manchuria and the cities of Qiqihar and Nenjiang County, Mergen, both of which served at various points as capitals of the Qing Heilongjiang. A portage road connected the upper reaches of the Nenjiang with Aigun on the Amur River, Amur as well.
In November 1931, the bridge over the Nen River near Jiangqiao Mongol Ethnic Town, Jiangqiao became the site of Resistance at Nenjiang Bridge, one of the first battles of the Second Sino-Japanese War.
Flooding of the Nen river - picture of 2005-07-21The tributaries of the Nen River
including the "Hydrography of Amur-Heilong River basin" map showing the course of the Nenjiang in detail.
Rivers of Heilongjiang
Rivers of Inner Mongolia