Kolong river

Since the reign of Swargadeo Suhungmung Dihingia roja when the Ahom kingdom extended much westward, it gained strategic, political and also commercial and economic importance.

Swargadeo Jayadhwaj Singha built two bridges over it as a part of war preparation against the Mughal[1] In the colonial period, though, the river was known to be widely used for passenger and goods transport, specially because the road and rail network was undeveloped or underdeveloped during that period.

In those days, the river created havoc by flooding the lowland areas in the present Nagaon and Morigaon districts during the rainy season, as it received water not only from the smaller streams, but also from the overflowing Brahmaputra.

Numerous fictional and non-fictional, famous and not-so-famous articles, and poems have been written taking the river as a main subject or character.

Assamese poet and novelist Nabakanta Barua wrote a famous novel Kokadeutar Had: The Bone of (my) Grandfather, fictionalizing the river and its history.

Several organizations including North East Centre for Environmental Research and Development (NE-CERD) advocate the re-opening of the river-mouth for its revival.

The primary reason for pollution was sewage and organic discharges from towns and communities situated along the river.