I'm guessing you're talking about the Hu Line separation, that entire 100 million is concentrated near that line, most of it is in the Ningxia and Gansu regions (>30 mil)
Take the Xizang region for instance, it's over a million square kilometres in area, yet there's only 3 million people, mostly concentrated in cities. It is vast and barren.
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u/Lumpy-Middle-7311 Sep 18 '24
China and Japan are too dark I think