5.

In passing in our geographical description from Europe to Asia, the first parts of the country which present themselves are those in the northern division, and we shall therefore begin with these.

Of these parts the first are those about the Tanaïs, (or Don,) which we have assumed as the boundary of Europe and Asia. These have a kind of peninsular form, for they are surrounded on the west by the river Tanaïs (or Don) and the Palus Mæotis894 as far as the Cimmerian Bosporus,895 and that part of the coast of the Euxine which terminates at Colchis; on the north by the Ocean, as far as the mouth of the Caspian Sea; on the east by the same sea, as far as the confines of Albania and Armenia, where the rivers Cyrus896 and Araxes897 empty themselves; the latter flowing through Armenia, and the Cyrus through Iberia898 and Albania;899 on the south is the tract of country extending from the mouth of the Cyrus as far as Colchis, and comprising about 3000 stadia from sea to sea, across the territory of the Albani, and Iberes,900 so as to represent an isthmus.901

Those writers do not deserve attention who contract the isthmus as much as Cleitarchus, according to whom it is subject to inundations of the sea from either side. According to Posidonius the isthmus is 1500 stadia in extent, that is, as large as the isthmus from Pelusium to the Red Sea. And I think, says he, that the isthmus between the Palus Mæotis and the Ocean is not very different from this in extent.