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How large was Pompeii inside its city walls?

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Ruins of ancient Pompeii with stone columns and walls in the foreground, and Mount Vesuvius rising in the background under a partly cloudy sky. — Pompeii Mount Vesuvius rising up over the ruins of the ancient Roman city Pompeii.

Inside its city walls, the ancient city of Pompeii encompassed an area of approximately 163 acres (66 hectares). The city walls themselves measure 2 miles (3 km) in circumference.1