Boat traffic on the Buriganga. The Buriganga or “Old Ganges” is a river in Bangladesh that flows through the southwest outskirts of the capital city, Dhaka; its depth ranges between 7 and 18 m (23 to 59 ft). The Buriganga is economically important as a connection to other parts of Bangladesh, a largely riverine country. When the Mughals made Dhaka their capital in 1610, the banks of the Buriganga were already a prime location for trade. Today, the Buriganga river is afflicted by pollution.