The Old Brahmaputra River () is a

distributary A distributary, or a distributary channel is a stream channel that branches off and flows a main stream channel. It is the opposite of a ''tributary'', a stream that flows another stream or river. Distributaries are a result of river bifurc ...

of the

Brahmaputra River The Brahmaputra is a trans-boundary river which flows through Southwestern China, Northeastern India, and Bangladesh. It is known as Brahmaputra or Luit in Assamese language, Assamese, Yarlung Tsangpo in Lhasa Tibetan, Tibetan, the Siang/Dihan ...

in north-central

Bangladesh Bangladesh, officially the People's Republic of Bangladesh, is a country in South Asia. It is the List of countries and dependencies by population, eighth-most populous country in the world and among the List of countries and dependencies by ...

. Historically it constituted the

main stem In hydrology, a main stem or mainstem (also known as a trunk) is "the primary downstream segment of a river, as contrasted to its tributaries". The mainstem extends all the way from one specific headwater to the outlet of the river, although t ...

of the Brahmaputra, however, the larger river's primary outflow was redirected via the

Jamuna River The Jamuna River () is one of the three main rivers of Bangladesh. The two other major rivers in Bangladesh are the Padma and the Meghna. The Jamuna is the lower stream of the Brahmaputra River, which originates in Tibet as Yarlung Tsangpo, ...

after the 1762 Arakan earthquake. Today, the Old Brahmaputra has been relegated to a minor river with much less flow than its former self. The river branches off from the Brahmaputra in Jamalpur District and

Mymensingh Mymensingh () is a metropolis, metropolitan city and capital of Mymensingh Division, Bangladesh. Located on the bank of the Old Brahmaputra River, Brahmaputra River, about north of the national capital Dhaka, it is a major financial center ...

then flows southeasterly for approximately before meeting the

Meghna River The Meghna () is one of the major rivers in Bangladesh, one of the three that form the Ganges Delta, the largest delta on earth, which fans out to the Bay of Bengal. A part of the Surma-Meghna River System, the Meghna is formed inside Banglade ...

Kishoreganj District Kishoreganj District () is a district in Dhaka Division, Bangladesh. Earlier it was a ''mahakuma'' (sub-division) under Mymensingh District, Mymensingh district. 2495.07 km2 of land was taken from Mymensingh District, Mymensingh district to fo ...

References

Rivers of Bangladesh Rivers of Mymensingh Division Rivers of Dhaka Division {{Mymensingh-geo-stub