...ver, it borders on and commands the "Caspian Gates," and touches the mountains of the Tapyri, which are not far from the Hyrcanian Sea. On the south it slopes down to Mesopotamia and the territory of Apollonia . It is protected from Persia by the barrier of Mount Zagrus, which has an ascent of a hundred stades, and containing in its range many separate peaks and defiles is subdivided by deep valleys, and at...