There is more to the Buriganga than meets the eye. Case in point: an old, iconic cannon known as Kaley Jamjam or Kalu Jamjam, lies somewhere in the bottom of the river! 

The story goes way back, when this piece of artillery was located in a "char" named Moghlani Char. But when the char got dissolved and taken over by the river, the cannon had disappeared with it, hence making Kaley Jamjam a lost treasure. 

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The Dhaka Gate Cannon: Secrets of Bibi Mariam

That was not the end of the cannon. Stating a folklore of the olden times, residents of Old Dhaka used to report that they sometimes heard roars coming from the river, and they attributed it to Kaley Jamjam, the lost and drowned cannon calling out to its partner — another iconic cannon of Dhaka named Bibi Mariam, which is still survives; now located near Dhaka Gate that you can visit and see today!

Source: Glimpses of Old Dhaka by Syed Muhammed Taifoor