Norfolk Island is about 384 times smaller than Montenegro.

Montenegro is approximately 13,812 sq km, while Norfolk Island is approximately 36 sq km, making Norfolk Island 0.26% the size of Montenegro. Meanwhile, the population of Montenegro is ~623,129 people (621,390 fewer people live in Norfolk Island).
Tip: This to-scale comparison of Montenegro vs. Norfolk Island uses the Mercator projection, which distorts the size of regions near the poles.
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