On the Mesopotamian side there would seem, from the accounts of Xenophon and Ptolemy, to have been an affluent which joined the Euphrates between Deir and `Ana, called Araxes by the former, Saocoras by the latter; but no trace of such a stream has been found by modern explorers and the country in general has always been uninhabited.
Horses and other draught animals are reared in the province, and there are several lakes frequented by water-fowl, and streams of clear water flow through it, as for instance the Kyros (Kur) formed by the junction of the Medos and Araxes."
Some rivers, notably the Kur (Kyros, Araxes) which flows into the Bakhtegan lake east of Shiraz, drain into inland depressions or lakes.
The southern boundary of Caucasia is in part coincident with the river Aras (Araxes), in part purely conventional and political.
Again war all but broke out; but, through the intervention of France, a treaty of partition was signed at Constantinople on the 23rd of June 1724, whereby the shores of the Caspian from the junction of the Kur and the Arras (Araxes) northwards should belong to Russia, while the western provinces of Persia should fall to the share of Turkey.