This river's largest tributary, which is connected to a large canal built by the Tughlaq dynasty, is worshipped as the deity Yami.
This river's largest tributary, which is connected to a large canal built by the Tughlaq dynasty, is worshipped as the deity Yami. High pollution levels in this river threaten many species native to it, including a namesake species of freshwater dolphin. Some of that pollution stems from the practice of releasing (*) cremation ashes into this river at sites such as Rishikesh and Haridwar. A glacier with a name similar to this river is the source of the Bhagirathi River, which is traditionally considered to be this river's true source. High concentrations of coliform bacteria are found downstream of another site on this river where many religious adherents bathe ritually; that site is Varanasi. For 10 points, name this river which merges with the Brahmaputra near its mouth, generally considered to be the holiest river in India. 
This river's largest tributary, which is connected to a large canal built by the Tughlaq dynasty, is worshipped as the deity Yami.
Ganga River [or Ganges River]