[8] Darrehshahr is in the southeastern part of the province, in the northern foothills of the Kabir Kuh ranges.

[9] It is believed that Darrehshahr was once Madaktu, an important city in the Anshan Province of Elamite Kingdom with a population of about 74,000.

The Parthians era was a period of relative revival but it was during the Sasanian Empire that the city, then a settlement of about 5000 household and renamed to Seymareh, saw its utmost restoration and success.

In ancient times, Elamites governed the Lorestan mountains and constructed several strong buildings.

Darrehshahr was the first Elamite city attacked and destroyed by Assyrians in addition to the massacre of people.

Furthermore, some foreign experts call the unearthed city as the second and lost capital of the Seleucids while some Iranian archaeologists believe that the monuments are part of the state of Sirvan.

Referencing some resources and texts, Darrehshahr may be the same as Mihrajanqadhaq, Saabzaan, Seymareh or the city of Khosrau II in the late Sassanid period completely leveled to earth from an earthquake in the years 248 and 344 A.H.[13] Despite the fact that there is no strong and reliable evidence to show the first time human beings settled in this area, most historians believe that Madakto Ancient City as a city in Sassanid era and because of its proximity to Ctesiphon was in fact a summer capital for kings in that era.

The great and impregnable fortress in east of Ctesiphon mountains that Khosrau II built to protect his family when threatened is believed to be in Darrehshahr as well.

[15] There are several archaeological sites round the city that are clear evidences of the importance of this city in ancient times: Bahram Choobin Gorge, Darrehshahr Fire Temple, Gavmishan Bridge, Jam Namesht Bridge, Koozeh Garan Hill, Majeen Ancient City, Majeen Gorge, Sassanid Bridge, Sheikh Makan Fort and Tikhan Hill.

The city resides in the lower valleys of the Kabir Kuh ranges and has been built on the banks of the Darrehshahr river.

There are four parks in and around the city: Darrehshahr's economy is mainly based on agriculture, orchards and ranching.

Agricultural products include: wheat, barley, cucumber, cantaloupe, honeydew, watermelon, legume, corn, fodder, rice, sesame, vegetables, pomegranate, grapes, and fig.

[26] Darrehshahr Industrial Park is located 11 km (6.8 mi) out of the city along the Darrehshahr-Pol-e Dokhtar road.

Darrehshahr county has about 2,000 active weavers and they annually create about 1,200 m2 (13,000 sq ft) rugs and hand-made carpets.

The name of the festival come from the word Sorna, an ancient woodwind instrument common between Iranian folkloric music of many areas.

The museum is home to 300 artifacts, pottery, coins, Stucco and many more belonging to eras of Achaemenid, Sassanid, Safavid, Qajar, etc.

based on the shape of buildings, materials and earthenware in and around the area, Darreh Shahr Ancient City belongs to late Sassanid era.

[39] Darreh Shahr Fire Temple is a four-arched building which is locally called Taaq (Persian: تاق).

[41] There are two major named surface routes in the city; the Nirooye Havaee boulevard which serves as the main arterial route into the city center running south-west connecting the Asad Abad, Ordoogah, Arazi Shahri and Sorkh Abad neighborhoods and merging into the Darrehshahr-Abdanan road; and, the Fahmideh-Seymareh boulevards which merge into roads running north-west to Ilam and south-east into Pol-e Dokhtar.

Darrehshahr has offered many great athletes over time in a variety of sports such as the Martial arts, Wrestling, Volleyball, Football, Boxing and Athletics.In TKD, the most renowned figures are Seyed Ali Seydi and Jalal Yari with silver and bronze medals in national taekwondo competitions and many gold medals at provincial level.

Ali Lotfinia was a volleyball player on the national youth team and a professional sports enthusiast.

Ali's dedication and talent have earned him recognition and respect in the world of volleyball, making him a role model for aspiring athletes in his hometown and beyond.

Universities: High schools in the city are as follows:[51] Media related to Darreh Shahr at Wikimedia Commons Iran portal