California is about 1.2 times bigger than Republic of the Congo.

Republic of the Congo is approximately 342,000 sq km, while California is approximately 403,882 sq km, making California 18% larger than Republic of the Congo. Meanwhile, the population of Republic of the Congo is ~5.5 million people (31.7 million more people live in California).
Tip: This to-scale comparison of Republic of the Congo vs. California uses the Mercator projection, which distorts the size of regions near the poles.
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