The Jamuna River ( 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 Bangladesh. The Jamuna flows south and joins the Padma River (Pôdda), near Goalundo Ghat, before meeting the Meghna River near Chandpur. It then flows into the Bay of Bengal as the Meghna River. The Brahmaputra-Jamuna is a classic example of a braided river and is highly susceptible to channel migration and avulsion. It is characterised by a network of interlacing channels with numerous sandbars enclosed between them. The sandbars, known in Bengali as chars, do not occupy a permanent position. The river deposits them in one year, very often to be destroyed later, and redeposits them in the next rainy season. The process of bank and deposit erosion together with redeposition has been going on continuously, making it difficult to precisely demarcate the boundary between the district of Pabna on one side and the districts of Mymensingh, Tangail and Dhaka on the other. The breaking of a char or the emergence of a new one is also a cause of much violence and litigation. The confluence of the Jamuna River and Padma River is unusually unstable and has been shown to have migrated southeast by over fourteen kilometres between 1972 and 2014. Course In Bangladesh, the Brahmaputra is joined by the Teesta River (or Tista), one of its largest tributaries. James Rennell made a survey between 1764 and 1777 and his maps are one of the earliest authentic maps of Bengal in existence. In these maps Teesta is shown as flowing through North Bengal in several branches — Punarbhaba, Atrai, Karatoya, etc. All these streams combined lower down with the Mahananda, now the westernmost river in North Bengal, and taking the name of Hoorsagar finally discharged into the Ganges at Jafarganj, near modern Goalundo. The Hoorsagar river is still in existence, being the combined outfall of the Baral, a spill channel of the Ganges, the Atrai, the Jamuna or Jamuneswari (not the main Jamuna through which the Brahmaputra now flows), and the Karatoya, but instead of falling into the Ganges, it falls into the main Jamuna, a few kilometres above its confluence with the Padma at Goalundo. Below the Teesta, the Brahmaputra splits into two distributary branches. The western branch, which contains