Why is the Ganges River considered especially sacred in Hinduism?

In Hinduism, the Ganges River is revered as the holiest of rivers and is personified as a goddess. Its sanctity is deeply rooted in mythology, which describes the river as originally flowing only in heaven.12

According to tradition, King Bhagiratha performed intense penance to bring the river to Earth to purify the ashes of his ancestors. Because the river’s descent was so powerful that it threatened to shatter the Earth, the god Shiva caught the falling waters in his matted locks to break the impact before releasing the river to flow across the land.23

Because of this divine origin, the Ganges is believed to possess immense purifying power. Hindus perform pilgrimage (tirthayatra) to its banks to bathe in its waters, which is considered cleansing of sin. Additionally, many believe that casting the ashes of the dead into the river grants the deceased a direct passage to heaven.14