Christmas Island is about 2.2 times bigger than British Indian Ocean Territory.

British Indian Ocean Territory is approximately 60 sq km, while Christmas Island is approximately 135 sq km, making Christmas Island 125% larger than British Indian Ocean Territory. Meanwhile, the population of British Indian Ocean Territory is ~3,000 people (1,308 fewer people live in Christmas Island).
Tip: This to-scale comparison of British Indian Ocean Territory vs. Christmas Island uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Christmas Island vs. British Indian Ocean Territory

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