Answer: TIGRIS

AnswerCrossword Clue
TIGRISFertile Crescent river
TIGRISMajor river to the Euphrates
TIGRISNineveh's river
TIGRISNineveh's locale
TIGRISEuphrates' counterpart
TIGRISBiblical river
TIGRISBagdad's river.
TIGRISMosul's river.
TIGRISBaghdad's river.
TIGRISEuphrates tributary, on which Mosul lies.
TIGRISRiver called Hiddekil in the Bible
TIGRISRiver through Iraq
TIGRISRiver often paired with the Euphrates
TIGRISIt joins the Euphrates
TIGRISMesopotamia border river
TIGRISFertile Crescent waterway
TIGRISBaghdad's river
TIGRISSight from Baghdad
TIGRISRiver past the ruins of Nineveh