Chad is about 21,400 times bigger than British Indian Ocean Territory.

British Indian Ocean Territory is approximately 60 sq km, while Chad is approximately 1,284,000 sq km, making Chad 2,139,900% larger than British Indian Ocean Territory. Meanwhile, the population of British Indian Ocean Territory is ~3,000 people (21.0 million more people live in Chad).
Tip: This to-scale comparison of British Indian Ocean Territory vs. Chad uses the Mercator projection, which distorts the size of regions near the poles.
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