[2] The Sundarbans area is intersected by an intricate network of interconnecting waterways, of which the larger channels are often 1.6 kilometres (0.99 mi) or more in width and run in a north-south direction.

These waterways now carry little fresh water as they are mostly cut off from the Ganges, the outflow of which has shifted from the Hooghly–Bhagirathi channels progressively eastwards since the 17th century.

This is due to subsidence of the Bengal Basin and a gradual eastward tilting of the overlying crust.

[3] The Piyali is heavily silted and most of it has been converted to low cultivated land, leaving only a narrow channel.

This article about a location in the South 24 Parganas district of West Bengal is a stub.