Japan is about 2.7 times smaller than Mauritania.

Mauritania is approximately 1,030,700 sq km, while Japan is approximately 377,915 sq km, making Japan 36.67% the size of Mauritania. Meanwhile, the population of Mauritania is ~4.2 million people (120.1 million more people live in Japan).
This to-scale comparison of Mauritania vs. Japan uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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