In recent decades, tourists' interest in the concept of geo-environment is constantly increasing. The term geotourism refers to a specific type of tourism that is represented by places of "special significance, rarity, or beauty" of geology that represent an area and its geological history, events, and processes. The main goal of the current research is to investigate and analyze the geotourism potential of geosites in the Lefur forest region using the M-GAM model. This area has various natural and pristine geosites located in Mazandaran province and has huge natural potentials. In this research, 6 geosites "Eskalim Waterfall, Gezo Waterfall, Terez Waterfall, Lefur Dam, Jalsang Waterfall, Haft Cascade" have been investigated and evaluated. The current research is of applied type and its research method is descriptive-survey. The method of data collection is documents and a survey that collected the necessary information using questionnaires from two statistical communities of experts and tourists. Also, M-GAM model and statistical tests using SPSS.26 and PLS3 have been used to analyze the data, and the findings show that according to the overall average and the resulting ranking, the Lefour Dam geosite ranks first in terms of geotourism potential, followed by seven waterfalls. has taken. According to the results of the research, all the studied areas had a high potential in geotourism, and this approach can lead to positive feedback and growth of the local economy for the development of a geotourism strategy in forest areas such as Lefur.