Helmand, also known as Hillmand, in ancient times, as Hermand and Hethumand, is one of the 34 provinces of Afghanistan, in the south of the country. It is the largest province by area, covering 58,584 square kilometres (20,000 sq mi) area. The province contains 18 districts, encompassing over 1,000 villages, and roughly 1,446,230 settled people. Lashkargah serves as the provincial capital. Helmand was part of the Greater Kandahar region until made into a separate province by the Afghan government in the 20th century.

The Kajaki Dam is "an earth and rockfill embankment type dam" located on the Helmand River in the Kajaki District of Helmand Province in Afghanistan, about 161 km (100 mi) northwest of Kandahar. It has a hydroelectric power station, which is operated by the Helmand and Arghandab Valley Authority through the Ministry of Energy and Water.