Japan is about 2.4 times smaller than Nigeria.

Nigeria is approximately 923,768 sq km, while Japan is approximately 377,915 sq km, making Japan 40.91% the size of Nigeria. Meanwhile, the population of Nigeria is ~225.1 million people (100.9 million fewer people live in Japan).
This to-scale comparison of Nigeria vs. Japan uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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