Page:Decline and Fall of the Roman Empire vol 4 (1897).djvu/395

Rh The extreme length of the Euxine sea, from Constantinople to the mouth of the Phasis, may be computed as a voyage of nine days and a measure or seven hundred miles. Prom the Iberian Caucasus, the most lofty and craggy mountains of Asia, that river descends with such oblique vehemence that in a short space it is traversed by one hundred and twenty bridges. Nor does the stream become placid and navigable till it reaches the town of Sarapana, five days' journey from the Cyrus, which Hows from the same hills, but in a contrary direction, to the Caspian lake. The proximity of these rivers has suggested the practice, or at least the idea, of wafting the precious merchandise of India down the Oxus, over the Caspian, up the Cyrus, and with the current of the Phasis into the Euxine and Mediterranean seas. As it successively collects the streams of the plain of Colchos, the Phasis moves with diminished speed, though accumulated weight. At the mouth it is sixty fathom deep and half a league broad, but a small woody island is interposed in the midst of the channel: the water, so soon as it has deposited an earthy or metallic sediment, floats on the surface of the waves and is no longer susceptible of corruption. In a course of one hundred miles, forty of which are navigable for large vessels, the Phasis divides the celebrated region of Colchos, or Mingrelia, which, on three sides, is fortified by