Sefid Rud
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Sefid Rud (sĕfēd´ rd) or Rud-e Safid , river, c.670 km long, rising in NW Iran and flowing generally east to meet the Caspian Sea at Rasht. The river is Iran's 2nd longest river after Karun. A storage dam on the river was completed in 1962. The Sefid Rud has cut a water gap through the Alborz Mountains, capturing two headwater tributaries and widening the valley between the Talesh Hills and the main Alborz range. The gap provides a major route between Tehran and the Caspian lowlands. The river was known in antiquity with the name of Mardus or Amardus. The river is famous for its numerous amount of fish.