The Chalus River (Persian: رود چالوس|Rud-e Čālūs),[1] or Chalus Rud is a major river located in central−northern Iran. It originates in the Kandovan and Taleghan mountains and passes through the city of Chalus in Mazandaran Province.
The river flows northward through the Central Alborz mountain range, to its river mouth on the southern Caspian Sea.