Mongolia is about 4.1 times bigger than Japan.

Japan is approximately 377,915 sq km, while Mongolia is approximately 1,564,116 sq km, making Mongolia 314% larger than Japan. Meanwhile, the population of Japan is ~124.2 million people (121.0 million fewer people live in Mongolia).
This to-scale comparison of Japan vs. Mongolia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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