Dez River
| Dez | |
|---|---|
| Dez Dam in Dezful city | |
| The basin of Dez River, as a tributary of Karun River | |
| Location | |
| Country | Iran | 
| Physical characteristics | |
| Mouth | |
|  • location | Karun River | 
| Length | 400 km (250 mi) | 
The Dez (Persian: دز), the ancient Coprates (/ˈkɒprətiːz/; 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.