Helmand River
The Helmand river, also historically known as the Etymandros, is the longest river in Afghanistan and the primary watershed for the endorheic Sistan Basin. It originates in the Sanglakh Range of the Hindu Kush mountains in the northeastern part of Maidan Wardak Province, where it is separated from the watershed of the Kabul River by the Unai Pass. The Helmand feeds into the Hamun Lake on the border of Afghanistan and Iran.
Etymology
The name comes from the Avestan Haētumant, literally "dammed, having a dam", which referred to the Helmand River and the irrigated areas around it. The word Haetumant is cognate with Sanskrit Setumatī meaning "one which has a dam."Geography
The Helmand stretches for. It rises in the northeastern part of Maidan Wardak Province in the Hindu Kush mountains, about 40 km west of Kabul, flowing southwestward through Daykundi Province and Uruzgan Province. After passing through the city of Lashkargah in Helmand Province, it enters the desert of Dasht-e Margo, and then flows to the Sistan marshes and the Hamun-i-Helmand lake region around Zabol at the Afghan-Iranian border. A few smaller rivers such as Tarnak and Arghandab flow into Helmand.This river, managed by the Helmand and Arghandab Valley Authority, is used extensively for irrigation, although a buildup of mineral salts has decreased its usefulness in watering crops. For much of its length, the Helmand is free of salt. Its waters are essential for farmers in Afghanistan, but it feeds into the Hamun Lake and is also important to farmers in Iran's southeastern Sistan and Baluchistan province.
A number of hydroelectric dams have created artificial reservoirs on some of the Afghanistan's rivers including the Kajaki Dam on the Helmand River. The chief tributary of the Helmand river, the Arghandab River, also has a major dam, north of Kandahar.