TIGRIS, a river of Asia, which has its source near that of the Euphrates in the mountain Tchildir in Turkomania: afterwards it separates Diarbekir from Erzerum, and Khufistan from Iraq-Arabia; and uniting with the Euphrates at Gorno, it falls into the gulf of Baffora, under the name of Schat el-Arab. This river passes by Diarbekir, Gezira, Mouful, Bagdad, Gorno, and Baffora.