What is the role of the Ganga River in Varanasi Tarpan rituals?

The Ganga is central to Tarpan in Varanasi. She is considered a purifier of sins and a direct conduit to the divine. Offering Tarpan water into the Ganga is believed to directly reach the ancestors, quenching their spiritual thirst and washing away negative karmas. Taking a holy dip (snan) in the Ganga before or after Tarpan is an essential part of the purification process