that separates Secunderabad from its twin city Hyderabad. In 1803, Nizam Sikandar Jah, the third Nizam of Hyderabad, changed Ulwul's name to Secunderabad after himself. The city was formed in 1806, after the order was signed by the Nizam allotting the land north of Hussain Sagar to set up the British Cantonment.

The drinking water needs of the British army in the cantonment and civilians in the cantonment area (areas now under Marredpally, Bowenpally and Tirumalgherry) were taken from Picket Lake (also