Rhode Island is about 18 times smaller than Dominican Republic.

Dominican Republic is approximately 48,670 sq km, while Rhode Island is approximately 2,706 sq km, making Rhode Island 5.56% the size of Dominican Republic. Meanwhile, the population of Dominican Republic is ~10.7 million people (9.6 million fewer people live in Rhode Island).
Tip: This to-scale comparison of Dominican Republic vs. Rhode Island uses the Mercator projection, which distorts the size of regions near the poles.
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