Nen River, one of the major tributaries to the Songhua River in Heilongjiang
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In November 1931, the acting governor of Heilongjiang province General Ma Zhanshan chose to disobey the Kuomintang government's ban on further resistance to the Japanese invasion and attempted to prevent Japanese forces from crossing into Heilongjiang province by defending a strategic railway bridge across the Nen River near Jiangqiao.
Below the dam, the Second Songhua flows northwest until its largest tributary, the Nen River, joins it near Da'an and creates the Songhua.