Lovely map; 15 inches may be a function of rice cultivation? For US midwest and Canada, wheat etc., I thought the demarcation was the 12 inch rainfall line, separating prairies from high plains....; so, as always, it's geography interacting with social technics....
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whodathunk there was a environmental difference between the sedentary agriculturalist peoples and the steppes pastoral nomadic peoples...
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I’m quite surprised if Heilongjiang doesn’t get enough rain. It’s very active agriculturally. That region of Xinjiang along the Kazakhstan border has a Mediterranean climate despite being one of the farthest areas from any ocean, and is also fertile. Maybe groundwater there.
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