We drove four hours east to the Heilong Jiang or Black Dragon River,58 which marks the border with Russia and gives China’s northernmost province its name.    From Wordnik.com.  [When a Billion Chinese Jump] Reference

Heilong. n.a. n.a. n.a. 500 n.a. n.a. n.a. 1000 n.a. 400.    From Wordnik.com.  [2. China] Reference