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and, in 1699, further south to Qiqihar. According to modern historians, the moves may have been driven by supply considerations: Nenjiang and Qiqihar are connected by a convenient waterway (Nen River) with southern Manchuria, whereas accessing Aigun (Heihe) would require either sailing all the way down the Sungari River until its confluence with the Amur and then up the Amur to Heihe, or using a portage over the Lesser Xing'an Mountains between

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