Oman is about 569 times bigger than Guam.

Guam is approximately 544 sq km, while Oman is approximately 309,500 sq km, making Oman 56,793% larger than Guam. Meanwhile, the population of Guam is ~168,999 people (5.3 million more people live in Oman).
Tip: This to-scale comparison of Guam vs. Oman uses the Mercator projection, which distorts the size of regions near the poles.
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