Sirwan River

Sîrwan (Continues in Iraq as Diyala river)
Sirwin River
Location
CountryIran/Iraq
Physical characteristics
Source 
  locationWestern Iran
Mouth 
  location
Tigris River
Length445 km (277 mi)
Basin size32,600 km2 (12,600 sq mi)

The Sirwan (Kurdish: Sîrwan, Sorani Kurdish: سيروان, Arabic: نهر ديالى, Persian: سیروان) is a river and tributary of the Tigris that originates in Iran. The Sirwan (or Sirvan) then runs mainly through eastern Iraq. It covers a total distance of 445 km (277 mi).