Mongolia is about 271 times bigger than Brunei.

Brunei is approximately 5,765 sq km, while Mongolia is approximately 1,564,116 sq km, making Mongolia 27,031% larger than Brunei. Meanwhile, the population of Brunei is ~478,054 people (2.7 million more people live in Mongolia).
This to-scale comparison of Brunei vs. Mongolia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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