PREVIEW
... breadth of one thousand five hundred miles, Wang Zongchang managed to create a narrow, tunnel-like map by exploring in a strip no more than one hundred miles wide in a zigzag pattern.
Furthermore, this tunnel-like map doesn't follow a straight line.
When Wang Zongchang detected a danger point ahead during his exploration, he would usually mark it and bypass it. Over time, this map twisted and turned like a snake.
This clearly showed the difficulties and dangers Wang Zong ...
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