Originally, Haleji Lake was small. During World War II the then-British Government of Sindh decided to increase the capacity of the lake by introducing a feeder canal from the River Sindh. The work was placed on a war footing and was completed within 24 months. During the war, thousands of American and British troops were stationed in Karachi; the water supply was provided by Haleji Lake..... Haleji originally was a salt-water lake which was formed by seasonal water, collecting in a depression. During World War II, additional water was required for troops stationed at Karachi. Salt water was drained out and an embankment was constructed around the lake which was fed by fresh water through a canal. Resultantly, Haleji became one of the major sources of water supply to the increasing population of Karachi as well as an exquisite refuge for waterfowl.
A water reservoir, home to Siberian migratory birds from November till February - birds lover paradise in these months. Some crocodiles as well, and fishing.