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In page Demographics of China:

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China is the second most populous country in the world and its national population density (137/km2) is very similar to those of countries like Denmark (excluding Greenland) or the Czech Republic. However, the overall population density of China conceals major regional variations. In 2002, about 94% of the population lived east of the Heihe–Tengchong Line; although this eastern area comprises only 43% of China's total land area, its population density, at roughly 280/km2, is comparable to that of Japan.[citation needed]