Sistan Basin

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Author:Laxman Burdak, IFS (Retd.)

Catchment of Helmand River

Sistan Basin is an inland endorheic basin encompassing large parts of southwestern Afghanistan and minor parts of southeastern Iran, one of the driest regions in the world and an area subjected to prolonged droughts.

Sistan watershed is a system

Its watershed is a system of rivers flowing from the highlands of Afghanistan into freshwater lakes and marshes and then to its ultimate destination: Afghanistan's saline Godzareh depression, part of the extensive Sistan terminal basin. The Helmand River drains the basin's largest watershed, fed mainly by snowmelt from the mountains of Hindu Kush, but other rivers contribute also.[1][2]

A basalt hill, known as Mount Khajeh, rises beside the lakes and marshes of the basin.

Lakes

The lowest part of the Sistan Basin contains a series of shallow lakes, known as hamuns. It appears that in the past there was a single Hamun Lake,[3] but there are now three separate lakes. From north to south the lakes are:

Hamun-e Puzak - The Hamun-e Puzak lies mostly in Afghanistan. It receives water from the Shelah Charkh channel of the Helmand River, and also from the Khash River and other small rivers.[4]

Hamun-e Sabari - The Hamun-e Sabari is split between Iran and Afghanistan. It receives water from the Parian branch of Helmand River, the Farah River and the Harut River.[5]

Hamun-e Helmand - The largest proportion of the Helmand River's waters flow into the Hamun-e Helmand, which is entirely in Iran, by a channel known as the Rud-e Sistan.


In times of flood the hamuns join into one large lake, and once every 20 years or so the floodwaters create an overflow from the Hamun-e Helmand by a normally dry river known as the Shela Rud, terminating in the Godzareh depression. In 1885 there was an exceptional flood, and the floodwaters filled the depression for three years.[4]

Archaeology

For more than 5,000 years the Sistan basin has been inhabited by sophisticated cultures and thus contains some key archaeological sites. The Shahr-i Sokhta, or "Burnt City", in Iran, built in 3100 B.C. near a currently dried-up branch of the Helmand River, was abandoned one thousand years later, most likely due climate changes that altered the river course. Kang and Zaranj in Afghanistan were major medieval cultural hubs, now covered by sand. Here, signs of historical irrigation systems, including canals, are still visible in the Dasht-e-Margo and Chakhansur areas while elsewhere canals are filled with silt and agricultural fields buried by shifting sand. Today the area is sparsely populated.[6]

Excavations have also revealed a citadel complex, and the remains of a Zoroastrian fire temple, on Mount Khajeh.

There are other important sites in this area.


Dahan-e Gholaman is a major Achaemenid archaeological site. It is believed to be the capital of the ancient satrapy of Zranka/Drangiana.


Ram Shahristan (or Abrashariyar) was an ancient capital of Sistan.

History

Jat clan

See also

References

  1. "History of Environmental Change in the Sistan Basin 1976 - 2005" (PDF).
  2. "Restoration, Protection and Sustainable Use of the Sistan Basin"
  3. "9: The issue of Lake Hamun and the Hirmand River". Central Eurasian water crisis: Caspian, Aral, and Dead Seas. United Nations University. 1998.
  4. Whitney, John (2006). "Geology, Water, and Wind in the Lower Helmand Basin" (PDF). U.S. Geological Survey.
  5. Whitney, John (2006). "Geology, Water, and Wind in the Lower Helmand Basin" (PDF). U.S. Geological Survey.
  6. "History of Environmental Change in the Sistan Basin 1976 - 2005" (PDF).

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