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"The Tigris River /ˈtaɪɡrɪs/ (( Arabic دجلة )) is the eastern member of the two great rivers that define Mesopotamia, the other being the Euphrates. The river flows south from the mountains of southeastern Turkey through Iraq."

"Most rivers in Iran are seasonal and have traditionally not been able to supply the needs of urban settlements. Major rivers like the Arvand, Aras, Zayandeh, Sefid and Atrak were few and far between in the vast lands of Persian antiquity. With the growth of urban settlements during the ages, locally dug deep wells (up to 100 meters deep) could no longer keep up with the demand, leading to the systematic digging of a specialized network of canals known as Qanat."

"Cuneiform script[nb 1] is one of the earliest known systems of writing,[1] distinguished by its "wedge-shaped" marks on clay tablets, made by means of a blunt reed for a stylus. The name cuneiform itself simply means "wedge shaped", from the Latin cuneus "wedge" and forma "shape," and came into English usage "probably from Old French cunéiforme."[2]"