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city in southeastern Heilongjiang sheng (province), China. It is located about 70 miles (110 km) west of the Chinese-Russian border. It is situated on the upper reaches of the Mudan River (Mudan Jiang), which is a tributary of the Sungari (Songhua) River in the mountains of eastern Northeast China (Manchuria). Until the 1920s Mudanjiang was little more than a large village that was overshadowed by the nearby county town of Ning'an.