South Africa is about 15,629 times bigger than Guernsey.

Guernsey is approximately 78 sq km, while South Africa is approximately 1,219,090 sq km, making South Africa 1,562,836% larger than Guernsey. Meanwhile, the population of Guernsey is ~67,491 people (57.4 million more people live in South Africa).
This to-scale comparison of Guernsey vs. South Africa uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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