Question: In which country are Tongjiang, Heilongjiang and Gao'an located?
Sentence (from "Tongjiang, Heilongjiang"): Tongjiang () is a city of 160,000 in eastern Heilongjiang province, People's Republic of China, located at the confluence and on the right banks of the Songhua and Amur Rivers, the latter which marks the border with Russia.
Relevant evidence: Yes