TIGRIS, a river of Asia, which has its source near that of the Euphrates in the mountain Tchildir in Turkomania: afterwards it separates Diarbek from Erzerum, and Khustan from Iac-Arabi; and uniting with the Euphrates at Gorno, it falls into the gulph of Buzarah, under the name of Schat el-Arab. This river passes by Diarbekar, Gezira, Mouful, Bagdad, Gorno, and Buzarah.