The Old Brahmaputra River ( bn, পুরাতন ব্রহ্মপুত্র নদী) is a

distributary A distributary, or a distributary channel, is a stream that branches off and flows away from a main stream channel. Distributaries are a common feature of river deltas. The phenomenon is known as river bifurcation. The opposite of a distributar ...

of the

Brahmaputra River The Brahmaputra is a trans-boundary river which flows through Tibet, northeast India, and Bangladesh. It is also known as the Yarlung Tsangpo in Tibetan, the Siang/Dihang River in Arunachali, Luit in Assamese, and Jamuna River in Bangla. It ...

in north-central

Bangladesh Bangladesh (}, ), officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most populous country in the world, with a population exceeding 165 million people in an area of . Bangladesh is among the mos ...

. Historically the

main stem In hydrology, a mainstem (or trunk) is "the primary downstream segment of a river, as contrasted to its tributaries". Water enters the mainstem from the river's drainage basin, the land area through which the mainstem and its tributaries flow.. A ...

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

Jamuna River The Jamuna River ( bn, যমুনা ''Jomuna'') is one of the three main rivers of Bangladesh. It is the lower stream of the Brahmaputra River, which originates in Tibet as Yarlung Tsangpo, before flowing into India and then southwest into ...

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 Jamalpur ( bn, জামালপুর জেলা, ''Jamalpur Jela'' also ''Jamalpur Zila'') is a district in Bangladesh, part of the Mymensingh Division. It was established in 1978. Geography Jamalpur occupies 2031.98 km2. It is locat ...

and flows southeasterly for approximately before meeting the

Meghna River The Meghna River ( bn, মেঘনা নদী) 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, ...

Kishoreganj District Kishoreganj ( bn, কিশোরগঞ্জ) is a district in Dhaka Division, Bangladesh. Earlier it was a Mohkuma (মহকুমা) under the Mymensingh district. It was taken 2495.07 sq. km of land from Mymensingh district to form prese ...

References

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