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18,618,000 square kilometers is about one-tenth as big as The Land area of Earth
In other words, it's 0.1250 times the size of The Land area of Earth, and the size of The Land area of Earth is 8 times that amount.
The Earth has a land area of 148,940,000 sq. km. Only an estimated one-eighth of this area — or 18,618,000 sq. km — is inhabitable by humans, with uninhabitable terrain such as deserts and high mountains covering the rest.
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