Puerto Rico is about 2.9 times smaller than Rwanda.

Rwanda is approximately 26,338 sq km, while Puerto Rico is approximately 9,104 sq km, making Puerto Rico 34.57% the size of Rwanda. Meanwhile, the population of Rwanda is ~14.6 million people (11.4 million fewer people live in Puerto Rico).
Tip: This to-scale comparison of Rwanda vs. Puerto Rico uses the Mercator projection, which distorts the size of regions near the poles.
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