The Qinling-Huaihe Line: China’s Invisible Boundary of Climate, Culture, and Cereal
秦岭—淮河线：气候、文化与主粮的隐形分界
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This east-west geomorphological seam separates China’s humid south from its semi-arid north with remarkable consistency.
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Winter temperatures rarely drop below freezing south of the line, enabling double-crop rice cultivation year after year.
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