Its position south-east of Nisibis was indifferently defined by ancient writers, with Stephanus of Byzantium calling it a city of Arabia "near Edessa" and Ptolemy placing it on the Tigris.[3] There is no doubt, however, that it and its adjacent mountain (ὸ Σίγγαρας ὄρος, ò Síngaras óros)[4] were the predecessors of the modern Sinjar and Mount Sinjar in modern Iraq's Nineveh plains.