Guatemala is about 1,815 times bigger than British Indian Ocean Territory.

British Indian Ocean Territory is approximately 60 sq km, while Guatemala is approximately 108,889 sq km, making Guatemala 181,382% larger than British Indian Ocean Territory. Meanwhile, the population of British Indian Ocean Territory is ~3,000 people (18.7 million more people live in Guatemala).
Tip: This to-scale comparison of British Indian Ocean Territory vs. Guatemala uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Guatemala vs. British Indian Ocean Territory

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