Alborz (in Persian البرز), also written as Alburz or Elburz, is a mountain range in northern Iran, stretching from the borders of Armenia in the north-west to the southern end of the Caspian Sea, where also Tehran and Iran's highest peak, Damavand (5604m) are, and ending in the east at the borders of Turkmenistan and Afghanistan. The Alborz mountain range forms a barrier between the south Caspian and the Qazvin-Tehran plateau. It is only 60-130 km wide and consists of sedimentary series dating from Upper Devonian to Oligocene, prevalently jurassic limestone over a granite core.

Alborz enjoys a central role in the historical texts of Iran such as the Shahnama, and also in Persian mythology.

It should not be confused with the Elbrus mountain in the Caucasus mountains.

Source

North, S.J.R., Guide to Biblical Iran, Rome 1956, p. 50