Wikipedia
Zarjoob
The Zarjoob , 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.