Parts of the country are surrounded by the Caucasian Mountains; for branches of these mountains, as I said before,1
project towards the south; they are fruitful, comprise the whole of Iberia, and border on both Armenia and Colchis. In the middle is a plain intersected by rivers, the largest being the Cyrus. This river has its beginning in Armenia, flows immediately into the plain above-mentioned, receives both the Aragus, which flows from the Caucasus, and other streams, and empties through a narrow valley into Albania; and between the valley and Armenia it flows in great volume through plains that have exceedingly good pasture, receives still more rivers, among which are the Alazonius, Sandobanes, Rhoetaces, and Chanes, all navigable, and empties into the Caspian Sea. It was formerly called Corus.