Sierra Leone is about 2.5 times smaller than Oklahoma.

Oklahoma is approximately 177,847 sq km, while Sierra Leone is approximately 71,740 sq km, making Sierra Leone 40.34% the size of Oklahoma. Meanwhile, the population of Oklahoma is ~3.8 million people (4.9 million more people live in Sierra Leone).
This to-scale comparison of Oklahoma vs. Sierra Leone uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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