Montenegro is about 2.8 times smaller than Bhutan.

Bhutan is approximately 38,394 sq km, while Montenegro is approximately 13,812 sq km, making Montenegro 35.97% the size of Bhutan. Meanwhile, the population of Bhutan is ~796,682 people (173,553 fewer people live in Montenegro).
Tip: This to-scale comparison of Bhutan vs. Montenegro uses the Mercator projection, which distorts the size of regions near the poles.
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