Morocco is about 1.2 times bigger than Japan.

Japan is approximately 377,915 sq km, while Morocco is approximately 446,550 sq km, making Morocco 18% larger than Japan. Meanwhile, the population of Japan is ~123.4 million people (84.9 million fewer people live in Morocco).
Tip: This to-scale comparison of Japan vs. Morocco uses the Mercator projection, which distorts the size of regions near the poles.
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