Renal's map of Bengal in 180 made no mention of the river Jamuna. Thirty years later, Buchanan Hamilton referred to the Jamuna as the main tributary of the Brahmaputra. The great flood of Bengal in 1787 brought about a great geographical change in the country. In this context, William Hunter said -
' the streets of Dhaka city were submerged to a depth sufficient to admit boats sailing them. 60000 persons perished during the inundation and subsequent famine.'
As a result of this great flood, the Brahmaputra changed its course and joined the Teesta. Before the eighteenth century, the Jamuna used to flow as a small canal called 'Jinai'. In a contemporary land movement of 18, the Barind region was separated from the Madhupur Garh region. As a result, the waters of the Teesta, Atrai, Mahananda, Punarbhaba, etc., flow through the narrow 'Jinai', creating the flow of the great Jamuna. In some places during the monsoon season the Jamuna is four to five miles wide.
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