Greece is about 1,692 times bigger than Guernsey.

Guernsey is approximately 78 sq km, while Greece is approximately 131,957 sq km, making Greece 169,076% larger than Guernsey. Meanwhile, the population of Guernsey is ~67,491 people (10.5 million more people live in Greece).
This to-scale comparison of Guernsey vs. Greece uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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