Sistan Lake:see Hamun-i-HelmandHamun-i-Helmand
or Sistan Lake
, marshy lake in the Sistan, c.5,000 sq mi (12,950 sq km), on the Iran-Afghanistan border. The lake, fed by the Helmand, Farah, and other rivers, varies in size during the year, achieving its maximum extent in the late spring, when it
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