Kamandal of Lord Brahma and along with her the Goddess Ganga brought the purity of heaven to the Earth.
On Ganga Dussehra devotees worship Goddess Ganga and take bath in Ganges. Taking bath in Ganges and offering charity or Dan-Punya (दान-पुण्य) on Ganga Dussehra day is considered highly auspicious. It is believed that holy dip in Ganges on Ganga Dussehra day can purge all type of sins.
Devotees flock to Allahabad/Prayag, Garhmukteshwar, Haridwar, Rishikesh and Varanasi to take a holy dip. Ganga Dussehra celebrations are legendary in Varanasi. On Ganga Dussehra day thousands of devotees do Ganga Snan and participate in Ganga Aarti at Dasaswamedh Ghat.
Ganga Dussehra should not be confused with Ganga Jayanti when the Goddess Ganga was reborn