Guinea-Bissau is about 2 times smaller than Sierra Leone.

Sierra Leone is approximately 71,740 sq km, while Guinea-Bissau is approximately 36,125 sq km, making Guinea-Bissau 50.36% the size of Sierra Leone. Meanwhile, the population of Sierra Leone is ~8.7 million people (6.7 million fewer people live in Guinea-Bissau).
This to-scale comparison of Sierra Leone vs. Guinea-Bissau uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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