The Ganga in devaloka. Ganga is called Alakananda when it flows through Devaloka, and known as Vaitarani when it flows through the land of pitrs, as per Mahabharata Adiparva Chapter 170 verses 21,22.

Alakanada starts from Vishnupada, flows to Devayana, which is studded with flying machines, then reaches Chandramandala, floods it and then reaches Brahmaloka, where it splits into Sita, Chakshush, Alakananda, Bhadra. Sita falls on the peaks of Meru, then flows onto the Gandhamadana mountain and finally the eastern sea via Bhadrashwavarsha. Chakshush falls on the peaks of the Malyavan mountains and finally into the western sea via Ketumala. Alakananda falls on the mountain Hemakuda and flows into the southern ocean. Bhadra falls on the Shringavan mountain and joins the norhern ocean. Alakananda is the holiest among these and those who bathe in it receive the same good effects as conducting the Rajasuya and Ashwamedha sacrifices, as per Srimahadevibhagavata Astamaskanda.