620 miles Akkadian empire Extended..
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100,000 sq miles
its about 128186meters
552
Cuniform It depends on what you mean by this question. There was no "official" writing in Mesopotamia. There were many civilizations at many different times, and still are. "Cuneiform" is the correct term if one is talking about the style of writing, but if one is talking about the language, then the most correct term would probably be "Akkadian." Akkadian was, for many years, the language of diplomacy used for correspondence between all the great kings of the mid- to late-Bronze Age, with the likely exception of the Mycenaean king, who appears to have employed Hittite/Neshili scribes but perhaps not Akkadian ones.
The longest surviving empire in the world was also one of the largest. The Roman Empire lasted the longest of all other empires, mainly because the Romans overtook many other empires in their dream for a powerful nation.