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Kabir Kuh ( fa, کبیرکوه; Kurdish: کڤەر -Kiver) is one of the long ranges of the 
Zagros Mountains
The Zagros Mountains ( ar, جبال زاغروس, translit=Jibal Zaghrus; fa, کوههای زاگرس, Kuh hā-ye Zāgros; ku, چیاکانی زاگرۆس, translit=Çiyakani Zagros; Turkish: ''Zagros Dağları''; Luri: ''Kuh hā-ye Zāgr ...
near the border of Lurestan and Ilam Provinces in Ilam province, Iran
Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...
. Covering an area of , Kabir Kuh stretches in length and in width along the Zagros Mountains
The Zagros Mountains ( ar, جبال زاغروس, translit=Jibal Zaghrus; fa, کوههای زاگرس, Kuh hā-ye Zāgros; ku, چیاکانی زاگرۆس, translit=Çiyakani Zagros; Turkish: ''Zagros Dağları''; Luri: ''Kuh hā-ye Zāgr ...
in the Northwest-Southeast direction. It begins about south of Ilam and stretches down to the vicinity of Andimeshk in Khuzestan
Khuzestan Province (also spelled Xuzestan; fa, استان خوزستان ''Ostān-e Xūzestān'') is one of the 31 provinces of Iran. It is in the southwest of the country, bordering Iraq and the Persian Gulf. Its capital is Ahvaz and it cover ...
. Made mainly by Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of ...
sedimentary rock
Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...
s, the Kabir Kuh range consists of a large number of mountains, including Shah Ahmad, Tabriz, Kaleh-bad, Filman, Damaghey-e Anar, Rivasan, Puneh, Sabzkhani, Zarrin, Golgol that are covered by snow and ice all year round. Its highest peak is Kan Seifi with elevation, south-east of Ilam. Kabir Kuh runs along the Seymareh river, which becomes Karkheh
The Karkheh or Karkhen کرخه (perhaps the river known as the Gihon—one of the four rivers of Eden/Paradise to the Bible and as the Choaspes in ancient times; also called Eulæus; Hebrew: אולי Ulai) is a river in Khūzestān Province, ...
when joins the Kashkan river before reaching the border of Ilam province and Khuzestan province
Khuzestan Province (also spelled Xuzestan; fa, استان خوزستان ''Ostān-e Xūzestān'') is one of the 31 provinces of Iran. It is in the southwest of the country, bordering Iraq and the Persian Gulf. Its capital is Ahvaz and it covers ...
. Kabir Kuh divides the mountainous region in western Iran into two regions generally referred as Piškuh (eastern side) and Poštkuh (western side), the latter virtually coinciding with Ilam.
The eastern side is dominated by steep slopes where water and wooded valleys abound. The western side is, however, quite dry but rich in oil reservoirs and underground resources.
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