Czech Republic is about 680 times bigger than Jersey.

Jersey is approximately 116 sq km, while Czech Republic is approximately 78,867 sq km, making Czech Republic 67,889% larger than Jersey. Meanwhile, the population of Jersey is ~102,146 people (10.6 million more people live in Czech Republic).
This to-scale comparison of Jersey vs. Czech Republic uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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