The 메대-바사 제국, also known as the 메디아-페르시아 제국, was an ancient empire that existed from the 7th to the 4th century BCE. It was formed by the unification of the 메디아 and 바사 kingdoms, with its capital in 수산. The empire is known for its vast territory, which included parts of modern-day Iran, Iraq, and beyond. The 메대-바사 제국 is notable for its achievements in administration, culture, and architecture. It was one of the first empires to implement a system of satrapies, or provinces, allowing for efficient governance. The empire also contributed to the spread of 조로아스터교 and left a lasting legacy in art and literature.