How is the Argun River connected to the Amur River?

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Wide autumn valley with golden grass in the foreground and low, tree-covered mountains of the Greater Khingan Range in the distance under a clear sky. — Inner Mongolia Da Hinggan (Greater Khingan) Range, southeast of Hailar, Inner Mongolia Autonomous Region, China.

The Argun River is a primary headstream of the Amur River. Near the village of Luoguhe, the Argun merges with the Shilka River to form the main course of the Amur River.1