Tongjiang in a county-level city in Jiamusi prefecture, Heilongjiang province in the People's Republic of China. The city has a population of over 100,000. Transportation China National Highway 221 History Early medieval history From 698 to 936, the kingdom of Balhae occupied northern Korea and parts of Manchuria and Primorsky Krai, consisting of the Nanai, the Udege, and the Evenks and descendants of the Tungus-speaking people and the people of the recently fallen Goguryeo kingdom of Kor… (More on Tongjiang)