Oman is about 1.2 times smaller than Japan.

Japan is approximately 377,915 sq km, while Oman is approximately 309,500 sq km, making Oman 81.9% the size of Japan. Meanwhile, the population of Japan is ~124.2 million people (120.5 million fewer people live in Oman).
This to-scale comparison of Japan vs. Oman uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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