The land of Subartu (Akkadian Šubartum/Subartum/ina Šú-ba-ri, Assyrian mât Šubarri) or Subar (Sumerian Su-bir4/Subar/Šubur) is mentioned in Bronze Age literature. The name also appears as Subari in the Amarna letters, and, in the form Šbr, in Ugarit.
Subartu was apparently a polity in Upper Mesopotamia, at the upper Tigris. Most scholars suggest that Subartu is an early name for Assyria proper on the Tigris and westward, although there are various other theories placing it sometimes a little farther to the east and/or north. Its precise location has not been identified. From the point of view of the Akkadian Empire, Subartu marked the northern geographical horizon, just as Mar.tu, Elam and Sumer marked "west", "east" and "south", respectively.
The Sumerian mythological epic Enmerkar and the Lord of Aratta lists the countries where the "languages are confused" as Subartu, Hamazi, Sumer, Uri-ki (Akkad), and the Martu land (the Amorites). Similarly, the earliest references to the "four quarters" by the kings of Akkad name Subartu as one of these quarters around Akkad, along with Martu, Elam, and Sumer. Subartu in the earliest texts seem to have been farming mountain dwellers, frequently raided for slaves.
Eannatum of Lagash was said to have smitten Subartu or Shubur, and it was listed as a province of the empire of Lugal-Anne-Mundu; in a later era Sargon of Akkad campaigned against Subar, and his grandson Naram-Sin listed Subar along with Armani, which has been identified with Aleppo, among the lands under his control. Ishbi-Erra of Isin and Hammurabi also claimed victories over Subar.