United Arab Emirates is about 12 times smaller than Mauritania.

Mauritania is approximately 1,030,700 sq km, while United Arab Emirates is approximately 83,600 sq km, making United Arab Emirates 8.11% the size of Mauritania. Meanwhile, the population of Mauritania is ~4.2 million people (5.8 million more people live in United Arab Emirates).
This to-scale comparison of Mauritania vs. United Arab Emirates uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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