4. Susa is situated in the interior, upon the river Choaspes, beyond the bridge; but the territory extends to the sea: and the sea-coast of this territory, from the borders of the Persian coast nearly as far as the mouths of the Tigris, is a distance of about 3000 stadia. The Choaspes flows through Susis, terminating on the same coast, and has its source in the territory of the Uxii.[445] For a rugged and precipitous range of mountains lies between the Susians and Persis, with narrow defiles, difficult to pass; they were inhabited by robbers, who constantly exacted payment even from the kings themselves, at their entrance into Persis from Susis. Polycletus says, that the Choaspes, and the Eulæus,[446] and the Tigris also enter a lake, and thence discharge themselves into the sea; that on the side of the lake is a mart, as the rivers do not receive the merchandise from the sea, nor convey it down to the sea, on account of dams in the river, purposely constructed, and that the goods are transported by land a distance of 800 stadia[447] to Susa; according to others, the rivers which flow through Susis discharge themselves by the intermediate canals of the Euphrates into the single stream of the Tigris, which on this account has at its mouth the name of Pasitigris. [CAS. 729] 5. According to Nearchus, the sea-coast of Susis is swampy, and terminates at the river Euphrates; at its mouth is a village, which receives the merchandise from Arabia; for the coast of Arabia approaches close to the mouths of the Euphrates and the Pasitigris; the whole intermediate space is occupied by a lake which receives the Tigris; on sailing up the Pasitigris 150 stadia is the bridge of rafts leading to Susa from Persis, and is distant from Susa 60 (600?) stadia; the Pasitigris is distant from the Oroatis about 2000 stadia; the ascent through the lake to the mouth of the Tigris is 600 (6000?) stadia;[448] near the mouth stands the Susian village (Aginis), distant from Susa 500 stadia; the journey by water from the mouth of the Euphrates, up to Babylon, through a well-inhabited tract of country, is a distance of more than 3000 stadia. Onesicritus says that all the rivers discharge themselves into the lake, both the Euphrates and the Tigris; and that the Euphrates, again issuing from the lake, discharges itself into the sea by a separate mouth. 6. There are many other narrow defiles in passing out through the territory of the Uxii, and entering Persis. These Alexander forced in his march through the country at the Persian Gates, and at other places, when he was hastening to see the principal parts of Persis, and the treasure-holds, in which wealth had been accumulated during the long period that Asia was tributary to Persis. He crossed many rivers, which flow through the country and discharge themselves into the Persian Gulf.