Sefid Rud sĕfēd´ ro͞od [key] or Safid Rudsä– [key], river, c.450 mi (720 km) long, rising in NW Iran and flowing generally east to meet the Caspian Sea at Rasht. A storage dam on the river was completed in 1962. The Sefid Rud has cut a water gap through the Elburz Mts., capturing two headwater tributaries and widening the valley between the Talesh Hills and the main Elburz range. The gap provides a major route between Tehran and the Caspian lowlands.
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