Republic of the Congo is about 629 times bigger than Guam.

Guam is approximately 544 sq km, while Republic of the Congo is approximately 342,000 sq km, making Republic of the Congo 62,768% larger than Guam. Meanwhile, the population of Guam is ~169,086 people (5.4 million more people live in Republic of the Congo).
This to-scale comparison of Guam vs. Republic of the Congo uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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