What contact existed between Chinese or other ancient eastern states and indigenous siberians? How was the land far north of the Yangtze regarded?

by Vortigern
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Well, could you clarify a bit?

  1. What do you mean by "ancient" in this context? Do you just mean pre-modern?
  2. What do you mean by "far north of the Yangtze?" In the earlier dynasties the Yellow River was the center of China, and the Yellow River is fairly north of the Yangtze.