Earth is a planet, home to about six billion humans and various numbers of other species. 'Region' would normally refer to some geographical part of it—an area with a certain climate, or boundaries that are larger than a city but smaller than a country.
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Earth is a planet, home to about six billion humans and various numbers of other species. 'Region' would normally refer to some geographical part of it—an area with a certain climate, or boundaries that are larger than a city but smaller than a country.
It doesn't sound like that's quite what you mean.