Seymareh River

The Seymareh (Persian: سیمره) is a river in southwestern Iran formed by the confluence of the Gharehsoo and Ghamasiab rivers in an area around southwest Kermanshah.^[1] Seymareh converges with Kashkan just before the historical Gavmishan Bridge near Darreh Shahr to create Karkheh River, an important river in Iran. The change of names from Seymareh to Karkheh is sometimes also considered farther downstream (at the mouth of Zal river at the border of the Khuzestan province).^[2]

Seymareh River
Seymareh near the Seymareh Bridge
Native name	رود سیمره (Persian)
Location
Country	Iran
Provinces	Kermanshah, Lorestan, Ilam
Counties	Kermanshah,
Physical characteristics
Source	Confluence of Gharehsoo and Ghamasiab rivers.
Length	417 km (259 mi)
Basin size	51,912 km2 (20,043 sq mi)
Discharge
• average	87.5 m3/s (3,090 cu ft/s)
Basin features
River system	Karkheh Watershed
Waterbodies	Seymareh Dam

The Seymareh Dam, a 480MW hydroelectric power station is located on the lower course of Seymareh near Cheshmeh Shirin, Darreh Shahr.