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The Dhanu, also called the Ghorautra, is a tributary of the Meghna. It flows directly southwards from Sunamganj in Sylhet through the eastern thanas of Netrakona and Kishoreganj. It is navigable year-round. It falls and rises with the daily tides and even the canals connected with it a long way inland, at places like Gag Bazar and Badla, experience the effect of these tides.