Explanation:

- Gurdwara Patalpuri Sahib is a significant Sikh gurdwara located in Kiratpur Sahib, Punjab, India. It's known for its sacred spiritual ambiance.

- This gurdwara is specifically associated with the ritual of immersing the ashes of the departed, which many believe brings peace to the souls.

- Option:1, Ganga, is a sacred river in India but not the one on which Gurdwara Patalpuri Sahib is located.

- Option:2, Beas, is another river in Punjab, holding its own significance but not related to this gurdwara.

- Option:3, Yamuna, is one of the major rivers in northern India, but it's not linked to Gurdwara Patalpuri Sahib.

- Option:4, Sutlej, is the correct river associated with Gurdwara Patalpuri Sahib.