Dez River

Dez
Dez Dam in Dezful city
The basin of Dez River, as a tributary of Karun River
Location
CountryIran
Physical characteristics
Mouth 
  location
Karun River
Length400 km (250 mi)

The Dez (Persian: دز), the ancient Coprates (/ˈkɒprətz/; Greek: Κοπράτης or Κοπράτας), is a river in Iran. This 400 km long river is a tributary of the Karun River. It is the site of the Dez Dam.