The Kajakai Dam is one of the two major hydroelectric power dams of Helmand province in southern Afghanistan, located on the Helmand River. It is located 100 miles (161 km) north-west of Kandahar City. It has a dual function, to provide electricity and to irrigate some 650,000 acres (1800 km²) of an otherwise arid land. Water discharging from the dam traverses some 300 miles (500 km) of downstream irrigation canals feeding farmland. It currently produces 33 megawatts of electricity.
It is 320 feet (100 m) high and 887 feet (270 m) long, with a storage capacity of 973,000 acre-feet (1.2 km³) of water. The dam is the main watershed for the Sistan Basin.