Manchar Lake is the largest freshwater lake in Pakistan and one of Asia's largest.

It is located west of the Indus River, in Dadu District, Sindh.

The area of the lake fluctuates with the seasons from as little as 350 km² to as much as 520 km².

The lake was created in the 1930s when the Sukkur Barrage was constructed on the river Indus.

The lake is fed by two canals, the Aral and the Danister from the river Indus.

Until recently the lake supported thousands of fisherfolk, near village Kot Lashari Bobak railway station, who depended on the freshwater fish they caught in the lake.

However, the lake is now undergoing environmental degradation resulting in the water becoming saline and killing off the fish and forcing the fisherfolk to look elsewhere for employment.

The degradation has been occurring for a long time but only recently have the effects been felt. The diversion of water from the Indus and a diminished storm runoff from the Kirthar mountains have contributed to the reduction in fresh water supplies.

At the same time, saline drainage water from agricultural fields in surrounding areas has started to flow into Lake Manchar.

However between 10 August and 23 August 2009, 700 cu ft/s (20 m3/s) of water was introduced in the lake via Indus River.