It covers 63,300 square kilometres (24,400 sq mi) and encompasses the southern and eastern slopes of the Alborz Mountains as well as their summits.

The Alborz range is composed of a granite core overlain with sedimentary rock including limestones, shales, sandstones, and tuffs.

Groups of native wild boar (Sus scrofa) forage at night, and beech martens (Martes foina) hunt smaller mammals and search for eggs and worms at dawn and dusk.

[1] Notable birds in this ecoregion are honey buzzard (Pernis apivorus), goshawk (Accipiter gentilis), black vulture (Aegypius monachus), bimaculated lark (Melanocorypha bimaculata) and Caspian snowcock (Tetraogallus caspius).

[1] Logging and agriculture have reduced the range of the forests in this ecoregion, dams have disrupted river flows, and overgrazing has degraded habitat.