evidence: Liu Jialei, 2014. A Study on the Evolution of the Sino-Russian Border and its Boundary Markers in the Eastern Sector of the Northeast. Heilongjiang: Heilongjiang Education Publishing House. (in Chinese) [...] Wang Wan Li Xing, 2018. The Heilongjiang River in the context of Sino-Russian relations: from the boundary of disputes to cooperation. Russian, East European & Central Asian Studies, (1): 69–94, 157. (in Chinese) [...] Heilongjiang River (Amur River in Russia) watershed