Guernsey is about 1,011 times smaller than Czech Republic.

Czech Republic is approximately 78,867 sq km, while Guernsey is approximately 78 sq km, making Guernsey 0.1% the size of Czech Republic. Meanwhile, the population of Czech Republic is ~10.7 million people (10.6 million fewer people live in Guernsey).
This to-scale comparison of Czech Republic vs. Guernsey uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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