Portugal is about 4.1 times smaller than Japan.

Japan is approximately 377,915 sq km, while Portugal is approximately 92,090 sq km, making Portugal 24.37% the size of Japan. Meanwhile, the population of Japan is ~124.2 million people (114.0 million fewer people live in Portugal).
This to-scale comparison of Japan vs. Portugal uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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