Zayandeh Rud zīyändĕ´ ro͝od [key] or Zaindeh Rudzīndĕ´ [key], river, c.250 mi (400 km) long, rising in the Zagros Mts., W central Iran, and flowing southeast through an agricultural district to a swamp W of Yazd; used for irrigation along its entire length. The Kuh-Rang Dam (built 1953) diverts water from the upper course of the Karun River through a 2-mi (3.2-km) tunnel into the Zayandeh Rud, where it is used to supplement irrigation in the Esfahan area. It is also spelled Zayinda Rud.
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