Mauritania is about 5 times bigger than Senegal.

Senegal is approximately 196,722 sq km, while Mauritania is approximately 1,030,700 sq km, making Mauritania 424% larger than Senegal. Meanwhile, the population of Senegal is ~17.9 million people (13.8 million fewer people live in Mauritania).
This to-scale comparison of Senegal vs. Mauritania uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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