Mauritania is about 2.5 times bigger than California.

California is approximately 403,882 sq km, while Mauritania is approximately 1,030,700 sq km, making Mauritania 155% larger than California. Meanwhile, the population of California is ~37.3 million people (33.1 million fewer people live in Mauritania).
This to-scale comparison of California vs. Mauritania uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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