Mauritania is about 1.2 times smaller than Mali.

Mali is approximately 1,240,192 sq km, while Mauritania is approximately 1,030,700 sq km, making Mauritania 83.11% the size of Mali. Meanwhile, the population of Mali is ~20.7 million people (16.6 million fewer people live in Mauritania).
This to-scale comparison of Mali vs. Mauritania uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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