Dear list members,

I have done some research on an author who declares he wrote his work while residing "in Kāmpilya, on the banks of the heavenly river".
I know there is a town called Kampil in Uttar Pradesh and I see in GoogleMaps that it is not very far from a channel called Old Ganges. Apart from GoogleMaps, other sources confirm the existence of a Kampil on the Old Ganges and the usage of such denomination with regard to one or two channels in that area of India. For these reasons, I assume I can safely identify my author's town of residence with Kampil in UP.
However, considering that there is at least another channel that is known as Old Ganges and that flows in present-day Bangladesh, now I'd like to know more about the usage of the denomination Old Ganges. Is it simply that every channel from which the bed of the river deviated at some point could receive this label, or was/is there one channel that was/is the Old Ganges par excellence?
I'd be interested in and grateful for any suggestions and references on this issue.

Best wishes,
Gaia Pintucci