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 descendants of the Tungus-speaking people and the people of the recently fallen Goguryeo kingdom of Korea.

[1] The vicinity of Tongjiang was settled at this moment by Funie Mohe tribes (Hanja/Hanzi: 拂涅靺鞨; pinyin: Fúniè Mòhé; Korean: 불열말갈).

These tribes were submitted to Balhae Kingdom under King Mun's reign (737-793).

Later, King Seon (r.818-830), administered their territories by creating a prefecture in the neighbourhood: The Dongpyong Prefecture (Korean: 동평부; Hanja: 東平府) with Yiju (Korean: 이주; Hanja: 伊州), present-day Dangbi (Chinese: 当壁; pinyin: Dāngbì) as its administrative centre.

[2] 2 Formally part of Oroqen Banner in Inner Mongolia but administered de facto by Daxing'anling Prefecture in Heilongjiang.