Illinois is around the same size as Nepal.

Nepal is approximately 147,181 sq km, while Illinois is approximately 143,961 sq km, making Illinois 97.81% the size of Nepal. Meanwhile, the population of Nepal is ~30.7 million people (17.8 million fewer people live in Illinois).
Tip: This to-scale comparison of Nepal vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles.
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