Which river is most closely associated with Hinduism

One river that is famous for being a Holy River in Hinduism is Ganges (or Ganga, as it's also called).

There is a religious ritual in Hinduism to bathe in this river, which in the recent years has caused the river to be very polluted.

Additionally, it is a major burial site in Hinduism: people cremate their relatives' bodies on wooden pyres on the river.