Sierra Leone is about 18 times smaller than Niger.

Niger is approximately 1,267,000 sq km, while Sierra Leone is approximately 71,740 sq km, making Sierra Leone 5.66% the size of Niger. Meanwhile, the population of Niger is ~24.5 million people (15.8 million fewer people live in Sierra Leone).
This to-scale comparison of Niger vs. Sierra Leone uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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