It begins about 20 km (12 mi) south of Ilam and stretches down to the vicinity of Andimeshk in Khuzestan.
Made mainly by Cretaceous sedimentary rocks,[3] 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 2,790 m (9,150 ft) elevation, 50 km (31 mi) south-east of Ilam.
[4][5][6] In prehistoric times, one of the largest known landslides occurred on the north-eastern slope of Kabir Kouh, moving across the Seymareh River.
The eastern side is dominated by steep slopes where water and wooded valleys abound.