Japan is about 1.2 times bigger than Oman.

Oman is approximately 309,500 sq km, while Japan is approximately 377,915 sq km, making Japan 22% larger than Oman. Meanwhile, the population of Oman is ~3.8 million people (120.5 million more people live in Japan).
This to-scale comparison of Oman vs. Japan uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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