[Foundahardheadedwoman]

Ethnically I think it would even subdivide further then this map shows.
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I read somewhere years ago that different languages were often spoken from one valley to the next, around 4000 the article or book said. That is why Mandarin is the official language of China. Seems possible that you are right.

[Reily]

Language differences usually imply ethnic differences, not always but quite often.