Alborz noun2 •A mountain range in northern Iran stretching from the borders of Azerbaijan and Armenia in the northwest to the southern end of the Caspian Sea, and ending in the east at the borders of Turkmenistan and Afghanistan.and Hyrcania could then have been annexed and associated as a separate satrapy with the Elburz peoples, all under Autophradates. — 1980 •A province of Iran.