Mongolia is about 1.2 times smaller than Sudan.

Sudan is approximately 1,861,484 sq km, while Mongolia is approximately 1,564,116 sq km, making Mongolia 84.03% the size of Sudan. Meanwhile, the population of Sudan is ~51.7 million people (48.1 million fewer people live in Mongolia).
Tip: This to-scale comparison of Sudan vs. Mongolia uses the Mercator projection, which distorts the size of regions near the poles.
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