The studies on natural resources are nowadays based on geomorphological investigations. This article provides a clear and detailed description of the units and main geomorphological phenomena of Chahar-Mahal and Bakhtiyari’s south region. The units consist of mountains, hills and high grounds, and alluvial plains which clearly reflect the effects of all types of erosion.The author mentions mass movements on the slopes of the region’s mountains, including landslip, debris and landslide. Moreover, the stony hill knolls and their formation, the alluvial hill knolls in clay and marn formation, located in the north-west of the region, and the role of water in the erosion andmodification of the uneven parts are studied.Among the existing phenomena in the area, creep, solifluxion, landslide and narrow creeks are discussed. Besides, Alloni and Jamal plains which make the alluvial slope plains of the region and the most interesting phenomenon found in Jamal plain, Gud-i Jamal (a small closed basin with its topographic slopes towards the center), and the central plain which is located in an alluvial strata formed by the sedimentary deposits of Khan Mirza and Chillah-Khanah rivers are dealt with. The main geomorphological forms in the region, including river deposits, alluvial terraces, lake deposits and fountains are also studied in detail.