Srimad Bhagavadgita and Holy Ganga

The Gita is superior even to the Holy River Ganga. In the scriptures, liberation has been declared to be the reward of a bath in the Ganga. But he, who bathes in the Ganga, though he can obtain liberation himself, does not acquire the power of liberating others. He, however, who takes a dive into the Gita not only gets liberated himself, but also gains the power of liberating others. The Ganga has sprung from the feet of the Lord, whereas the Gita has emanated directly from the divine lips. Again, while the Ganga liberates him alone who goes to it and takes a plunge in it waters, the Gita finds its way to every home, and shows the way to liberation to every individual. These are the reasons why the Gita is declared as superior to the Ganga.

Origin of Ganga
Vishnu once heard Shiva play the flute and was so entranced by the music that his feet began to melt. Brahma caught the liquefied portion of Vishnu in a pot and from it created Ganga, the river-goddess. Hence Ganga is also known as Vishnu-padi (she-who-was-born-out-of-Vishnu's-feet).

Ganga is the most sacred river of India. She is depicted bearing a pot and riding a makara that is sometimes identified as a crocodile, sometimes as a dolphin and sometimes as a Capricorn like sea-monster that is half fish and half elephant.

Once she flowed in the heavens but then was ordered to go down to earth. Fearing that her forceful descent might wash away the earth, the gods sought the help of Shiva. Shiva broke the fall of Ganga by capturing her in his mighty locks. Since then, Ganga resides on top of Shiva's head as his second wife, the first being Parvati.