Vermont is about 1.3 times smaller than Belgium.

Belgium is approximately 30,528 sq km, while Vermont is approximately 23,956 sq km, making Vermont 78.47% the size of Belgium. Meanwhile, the population of Belgium is ~11.8 million people (11.2 million fewer people live in Vermont).
Tip: This to-scale comparison of Belgium vs. Vermont uses the Mercator projection, which distorts the size of regions near the poles.
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