Strabo, Geography
H.C. Hamilton, Esq., W. Falconer, M.A., Ed.

From the south flow both rivers, the Euphrates and the Tigris, which encircle Mesopotamia, and approach close to each other at Babylonia, and then discharge themselves into the sea on the coast of Persia. The Euphrates is the larger river, and traverses a greater tract of country with a tortuous course, it rises in the northern part of Taurus, and flows toward the west through Armenia the Greater, as it is called, to Armenia the Less, having the latter on the right and Acilisene on the left hand. It then turns to the south, and at its bend touches the boundaries of Cappadocia. It leaves this and Commagene on the right hand; on the left Acilisene and Sophene,¹ belonging to the Greater Armenia. It proceeds onwards to Syria, and again makes another bend in its way to Babylonia and the Persian Gulf.

The Tigris takes its course from the southern part of the same mountains to Seleucia,² approaches close to the Euphrates, with which it forms Mesopotamia. It then empties itself into the same gulf.

The sources of the Tigris and of the Euphrates are distant from each other about 2500 stadia.