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Where does the Old Brahmaputra River flow in Bangladesh?

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Map showing the course of the Brahmaputra River as it flows from southwestern China through northeastern India and into Bangladesh, with surrounding countries including Bhutan, Nepal, Myanmar, Pakistan, and Afghanistan labeled. The river's path is highlighted in blue, and major international boundaries are marked. — Brahmaputra River Brahmaputra River.

In Bangladesh, the Old Brahmaputra River leaves the left bank of the main stream (the Jamuna River) south of Gaibanda. From there, it flows past the towns of Jamalpur and Mymensingh before joining the Meghna River at Bhairab Bazar.1

Historically, this channel served as the main course of the Brahmaputra until the late 18th century, when the river shifted its primary flow to the channel now known as the Jamuna. Today, the Old Brahmaputra continues to play a significant role in the region's geography, having helped build the flood basin of the Meghna River.23