Mauritius is about 26 times bigger than Guernsey.

Guernsey is approximately 78 sq km, while Mauritius is approximately 2,040 sq km, making Mauritius 2,515% larger than Guernsey. Meanwhile, the population of Guernsey is ~67,491 people (1.2 million more people live in Mauritius).
This to-scale comparison of Guernsey vs. Mauritius uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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