Dominican Republic is about 23 times smaller than Colombia.

Colombia is approximately 1,138,910 sq km, while Dominican Republic is approximately 48,670 sq km, making Dominican Republic 4.27% the size of Colombia. Meanwhile, the population of Colombia is ~49.1 million people (38.4 million fewer people live in Dominican Republic).
Tip: This to-scale comparison of Colombia vs. Dominican Republic uses the Mercator projection, which distorts the size of regions near the poles.
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