Christmas Island is about 574 times smaller than Serbia.

Serbia is approximately 77,474 sq km, while Christmas Island is approximately 135 sq km, making Christmas Island 0.17% the size of Serbia. Meanwhile, the population of Serbia is ~6.7 million people (6.7 million fewer people live in Christmas Island).
This to-scale comparison of Serbia vs. Christmas Island uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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