The Tirthan stream , famous for its trout, rises from the icy cold spring of Hanskund peak (4800mts.) and flows down through a lovely and deep forested Rohla terrain rated as one of the finest forest e state in India.

Thanks to the commandments of Hanskund deity that killing and maiming of wild birds and mammal is prohibited but the poachers in the past have ignored this wa rning with impunity.

This terrain now forms the core zone of the Great HimalayanNational Park.

After covering a distance of 70 km. from the source, the Tirthan joins its sister tributary, the Palchan at Gushaini, a place where Goddess Gara‐Durga had acquired divine power by self immolation.