a river of Asia, which has its source near that of the Euphrates in the mountain Tcheldir in Turcomania: afterwards it separates Diarbekir from Erzerum, and Khusistan from Irac-Arabia; and uniting with the Euphrates at Gorna, it falls into the gulf of Bassorah, under the name of Schat el Arab. This river passes by Diarbekir, Gezira, Mousul, Bagdad, Gorna, and Bassorah.