Darreh Shahr (; also
Romanized as
Darreh-ye Shahr) is a town and the capital of
Darreh Shahr County,
Ilam Province,
Iran. It's situated in a wide valley in the northern hillsides of
Kabir Kuh ranges. At the 2011 census, its population was reported 24,961. The ruined ancient city of
Darreh Shahr Ancient City is located in the southern part of Darreh Shahr. It has been extensively excavated by archaeologists. The
Seymarah River flows to the north of the city. The city has a lot of potentials in
agriculture, rich water supplies, green fields and dense forests.