The modern nation of Iran encompasses much of the land once controlled by the ancient Persian Empire, stretching from the Persian Gulf to the borders of Turkey and Turkmenistan. Historically, the southwestern region of Iran was known as Persis, commonly referred to as Persia. This region served as the heartland of the Achaemenid Empire, founded by Cyrus the Great. The name “Persia” subsequently became widely used to denote the entire empire and, for centuries, the land itself. The article explores the geographical origins of the name “Persia” and its connection to the modern country of Iran, highlighting how a specific region lent its name to an entire civilization and nation. Understanding this history provides context for the region’s complex cultural and political identity.