Naarmalcha (Grecized form of the Aramaic Nahar Malkā, meaning the King's Canal or the Royal Canal; in Arabic:نهر الملك Nahr al-Malik) was a river or canal in central Babylonia that linked Euphrates and Tigris rivers. It corresponds to the older Royal River (Akkadian: nār šarri; Ancient Greek:Νααρσάρης Naarsárēs; Latin:Marses) in the Assyriological sources.

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