Cuba is about 12 times bigger than Puerto Rico.

Puerto Rico is approximately 9,104 sq km, while Cuba is approximately 110,860 sq km, making Cuba 1,118% larger than Puerto Rico. Meanwhile, the population of Puerto Rico is ~3.1 million people (7.9 million more people live in Cuba).
This to-scale comparison of Puerto Rico vs. Cuba uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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