California is about 1.3 times bigger than Oman.

Oman is approximately 309,500 sq km, while California is approximately 403,882 sq km, making California 30% larger than Oman. Meanwhile, the population of Oman is ~3.8 million people (33.5 million more people live in California).
This to-scale comparison of Oman vs. California uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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