China is about 4 times bigger than Algeria.

Algeria is approximately 2,381,740 sq km, while China is approximately 9,596,960 sq km, making China 303% larger than Algeria. Meanwhile, the population of Algeria is ~44.2 million people (1.4 billion more people live in China).
This to-scale comparison of Algeria vs. China uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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