As you dig a little deeper into this map there are some definite questions.
First off the map itself dates from the 18th century and only has a small note that it is a copy of a map from 1418. The map also uses language that does not fit the style of Ming China plus the owner won't let anyone see the original only copies. It makes me a tad skeptical about it's authenticity.
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- Taking it one step at a time.
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