Sierra Leone is about 2 times smaller than Illinois.

Illinois is approximately 143,961 sq km, while Sierra Leone is approximately 71,740 sq km, making Sierra Leone 49.83% the size of Illinois. Meanwhile, the population of Illinois is ~12.8 million people (4.1 million fewer people live in Sierra Leone).
This to-scale comparison of Illinois vs. Sierra Leone uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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