The northwestern Fars province of Iran is prone to landslides. In order to help the planners in the selection of suitable locations to implement development projects, a landslide susceptibility map has been produced for the Kakan catchment area using the gamma aggregation operation of the fuzzy approach. Lithology, slope angle, slope aspect, land cover, weathering depth, proximity to roads, topographical elevation, and soil depth were considered as landslide causal factors for the study area. Three values for gamma were examined and output maps were evaluated using the known landslides. Performing fuzzy gamma operation with 0.94 for gamma and classifying the area yielded an output susceptibility map with four zones: non-susceptible, moderate susceptibility, high susceptibility, and very high susceptibility. Gamma values <0.94 decreased the fuzzy membership functions to low susceptibility zones, and eliminated the high and very high classes. Gamma values >0.94 moved the output fuzzy membership function values to high and very high landslide susceptibilities and eliminated the moderate susceptible zones. Comparing the known landslides of the area with the output susceptibility map showed that 93.9% of the identified landslides were located in the high susceptible zone and 6.1% in very high susceptible zone.

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