The Akkadian Empire () was the second ancient empire of Mesopotamia, after the long-lived civilization of Sumer. It was centered in the city of Akkad and its surrounding region. The empire united Akkadian (Assyrian and Babylonian) and Sumerian speakers under one rule. The Akkadian Empire exercised influence across Mesopotamia, the Levant, and Anatolia, sending military expeditions as far south as Dilmun and Magan (modern Bahrain and Oman) in the Arabian Peninsula.