|Native name||Espī bīeh|
|• location||Alborz Mountains|
|Length||670 km (420 mi)|
|Basin size||13,450 km2 (5,190 sq mi)|
|• left||Qizil Owzan|
The Sefīd-Rūd (Gilaki: اسپي بيه, Espī bīeh) (also known as Sepid-Rud) is a river approximately 670 kilometres (416 mi) long, rising in the Alborz mountain range of northwestern Iran and flowing generally northeast to enter the Caspian Sea at Rasht. The river is Iran's second longest river after the Karun.
The Sefid-Rud has cut a water gap through the Alborz mountain range, the Manjil gap, capturing its two headwater tributaries, the Qizil Üzan and Shahrood rivers. It then widens the valley between the Talesh Hills and the main Alborz range. The gap provides a major route between Tehran and Gīlān Province with its Caspian lowlands.
Dam and reservoir
The Sefid-Rud was dammed in 1962 by the Shahbanu Farah Dam (later renamed Manjil Dam), which created a 1.86 cubic kilometres (0.45 cu mi) reservoir and allowed the irrigation of an additional 2,380 km2 (919 sq mi). The reservoir mediates some flooding and significantly increased rice production in the Sefid Rud Delta. The hydroelectric component of the dam generates 87,000 kilowatts. The completion of the dam had a negative impact on the river's fisheries, through reduced stream flow (due to diversion), increased water temperature, and decreased food availability, especially for sturgeon but also for the Caspian trout.
The river was known in antiquity by the names Mardos (Greek: Μαρδος; Latin: Mardus) and Amardos (Greek: Αμαρδος; Latin: Amardus). In the Hellenistic period the north side of the Sefid (then Mardus) was occupied by the mountain tribe the Cadusii.
- Fortescue, L. S. (April 1924) "The Western Elburz and Persian Azerbaijan" The Geographical Journal 63(4): pp. 301-315, p.310
- Rawlinson, H. C. (1840) "Notes on a Journey from Tabríz, Through Persian Kurdistán, to the Ruins of Takhti-Soleïmán, and from Thence by Zenján and Ṭárom, to Gílán, in October and November, 1838; With a Memoir on the Site of the Atropatenian Ecbatana" Journal of the Royal Geographical Society of London 10: pp. 1-64, p. 64
- Smith, William, ed. (1854–1857). Dictionary of Greek and Roman Geography. London: John Murray. Missing or empty
- Charles Rollin (1860). The Ancient History of the Egyptians, Assyrians, Chaldeans, Medes, Persians, Macedonians, the Selucidae in Syria, and Parthians., Volumes 3-4. Cincinnati: J.W. Sewell & Co. p. 30. Retrieved August 23, 2018. CS1 maint: discouraged parameter (link)
- "Salmo trutta caspius, Kessler, 1870" Caspian Environment Programme
- Fortescue, L. S. (April 1924) "The Western Elburz and Persian Azerbaijan" The Geographical Journal 63(4): pp. 301-315, p.303
- Rabino, H. L. (November 1913) "A Journey in Mazanderan (From Resht to Sari)" The Geographical Journal 42(5): pp. 435-454, p. 435
- Beaumont, Peter (1974) "Water Resource Development in Iran" The Geographical Journal 140(3): pp. 418-431, p.428
- Gittinger, J. Price (October 1967) "Planning and Agricultural Policy in Iran: Program Effects and Indirect Effects" Economic Development and Cultural Change 16(1): pp. 107-117, p. 110
- Carey, Jane Perry Clark and Carey, Andrew Galbraith (1976) "Iranian Agriculture and Its Development: 1952-1973" International Journal of Middle East Studies 7(3): pp. 359-382, p. 372
- Jackson, Donald C. and Marmulla, Gerd (2001) "The Influence of Dams on River Fisheries: Regional Assessments: 3.2.2 Southern and Central Asia, Kazakhstan, and the Middle East" (accessed 28 November 2008), In Marmulla, Gerd (ed.) (2001) Dams, fish and fisheries: Opportunities, challenges and conflict resolution (FAO Fisheries Technical Paper. No. 419) Fisheries and Aquaculture Department, Food and Agriculture Organization, Rome, ISBN 92-5-104694-8, citing Vladykov, Vadim D. (1964) Report to the Government of Iran on the Inland Fisheries Resources of Iran, Especially of the Caspian Sea with Special Reference to Sturgeon (Expanded program of technical assistance, Report No. 1818) Food and Agriculture Organization, Rome, OCLC 236127104
- Strabo, xi. 13
- "Sefid Rood Watershed" Economic potentials of Kurdistan Province in the fields of Water, Agriculture and Natural Resources Ministry of Interior, Islamic Republic of Iran