Guam is about 1.5 times smaller than Kiribati.

Kiribati is approximately 811 sq km, while Guam is approximately 544 sq km, making Guam 67.08% the size of Kiribati. Meanwhile, the population of Kiribati is ~114,189 people (54,897 more people live in Guam).
This to-scale comparison of Kiribati vs. Guam uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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