Italy is about 1.2 times smaller than Japan.

Japan is approximately 377,915 sq km, while Italy is approximately 301,340 sq km, making Italy 79.74% the size of Japan. Meanwhile, the population of Japan is ~124.2 million people (63.1 million fewer people live in Italy).
This to-scale comparison of Japan vs. Italy uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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