Zard Kuh is a sub-range in the central Zagros Range , Iran .With an elevation of 4221 metres , the Zardkuh is located in the Zagros Mountains in the Chaharmahal and Bakhtiari Province of Iran . The Karun and also Zayanderud rivers start in the Zagros mountains near the Zardkuh . There are small glaciers on the mountain owing to the relatively high precipitation , which are the only glaciers in the subtropics outside the Himalayas , Andes and Trans-Mexican Volcanic Belt .
Geologically , the Zardkuh is situated in the Sanandaj-Sirjan geologic and structural zone of Iran and is mainly made of cretaceous limestone .
Famous documentary Grass : A Nation's Battle for Life (1925) captures on film the Bakhtiari tribe's amazing crossing of Zard Kuh barefoot in the snow with 50,000 people and 500,000 animals .