Puerto Rico is about 42 times smaller than Japan.

Japan is approximately 377,915 sq km, while Puerto Rico is approximately 9,104 sq km, making Puerto Rico 2.41% the size of Japan. Meanwhile, the population of Japan is ~124.2 million people (121.1 million fewer people live in Puerto Rico).
This to-scale comparison of Japan vs. Puerto Rico uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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