Guyana is about 1.5 times bigger than Illinois.

Illinois is approximately 143,961 sq km, while Guyana is approximately 214,969 sq km, making Guyana 49% larger than Illinois. Meanwhile, the population of Illinois is ~12.8 million people (12.0 million fewer people live in Guyana).
This to-scale comparison of Illinois vs. Guyana uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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