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The Zarjoob (Persian: زرجوب‎), also known as the Shah-Rud or Shahrood river, flows through the Alborz (Elburz) mountain range, from Mazandaran Province west into Gilan Province, in northern Iran.

The Zarjoob/Shah-Rud river is one of two main tributaries, along with the Qizil Üzan river, that form the Sefīd-Rūd river, a tributary of the Caspian Sea at Rasht. The Sefīd-Rūd and its reservoirs are a major source of water for local domestic and agricultural uses.


The Sefīd-Rūd is the most polluted river in Gilan Province, and among the most within Iran. This river plays a crucial role in spreading microbial diseases directly or indirectly. The sources of pollution of the river may be classified into industrial wastewater, urban sewage and agricultural wastewater. All shops and markets introduce their waste materials into this river. In order to measure the degree of pollution, BOD, COD, pH, NO3, TSS, DO and coliform tests were carried out. Samples were collected in 12 points (agricultural, industrial and urban areas) were collected for analysis every three months and the results were compared to environmental standards. Result shows that pollution of the river is above allowed levels and that the river lacks any self-refining system. Ten TSS tests out of 12 (with concentration 500 mg/L), ten TDS tests, seven BOD tests, eleven COD tests, four FTU tests, three pH tests and all coliform tests revealed the fact that pollution in this river has exceeded allowed levels.[citation needed]

Map of rivers in the Central Alborz mountain range[edit]

The Zarjoob/Shah-Rud river is #12 in the lower left of the map.

Map of central Alborz Peaks: 1 Alam-Kuh
  −25 to 500 m (−82 to 1,640 ft)
  500 to 1,500 m (1,600 to 4,900 ft)
  1,500 to 2,500 m (4,900 to 8,200 ft)
  2,500 to 3,500 m (8,200 to 11,500 ft)
  3,500 to 4,500 m (11,500 to 14,800 ft)
  4,500 to 5,671 m (14,764 to 18,606 ft)
2 Azad Kuh 3 Damavand
4 Do Berar 5 Do Khaharan
6 Ghal'eh Gardan 7 Gorg
8 Kholeno 9 Mehr Chal
10 Mishineh Marg 11 Naz
12 Shah Alborz 13 Sialan
14 Tochal 15 Varavašt
Rivers: 0
1 Alamut 2 Chalus
3 Do Hezar 4 Haraz
5 Jajrood 6 Karaj
7 Kojoor 8 Lar
9 Noor 10 Sardab
11 Seh Hazar 12 Shahrood
Cities: 1 Amol
2 Chalus 3 Karaj
Other: D Dizin
E Emamzadeh Hashem K Kandovan Tunnel
* Latyan Dam ** Lar Dam

See also[edit]