California is around the same size as Paraguay.

Paraguay is approximately 406,752 sq km, while California is approximately 403,882 sq km, making California 99.29% the size of Paraguay. Meanwhile, the population of Paraguay is ~7.4 million people (29.9 million more people live in California).
Tip: This to-scale comparison of Paraguay vs. California uses the Mercator projection, which distorts the size of regions near the poles.
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