Eber-Nari (Akkadian, also Ebir-Nari) or Abar-Nahara עבר-נהרה (Aramaic) was the name of a region of Western Asia and a satrapy of the Neo-Assyrian Empire, Neo-Babylonian Empire and Achaemenid Empire, which roughly corresponded with the Levant. It means "Beyond the River" or "Across the River" in both Akkadian and Aramaic (that is, the Western bank of the Euphrates from a Mesopotamian and Persian viewpoint). It is also referred to as Transeuphratia (French Transeuphratène) by modern scholars. The province is also mentioned extensively in the Biblical books of Ezra and Nehemiah.
The toponym appears in an inscription of the 7th century BC Assyrian king Esarhaddon. In 535 BC the Persian king Cyrus the Great organized most of the newly conquered territories of the former Neo-Babylonian Empire as a single satrapy, "Babylonia and Eber-Nari". The satrap resided in Babylon and there were subgovernors in Eber-Nari, one of which was Tettenai, mentioned in both the Bible and Babylonian cuneiform documents. This organization remained untouched until at least 486 BC (Xerxes I's reign), but before c. 450 BC the "mega-satrapy" was split into two—Babylonia and Eber-Nari.