An analysis was carried out on the horizontal structure and the diameter distribution of a low hill forest located in Cutting Plot 1 (PC 1), belonging to the of a low hill forest located in Cutting Plot 1 (PC 1), belonging to the General Plan of Forest Management (PGMF). No. 16-LOR-MAR/CON-MAD-2024-01, in the district of San Pablo. During the 737 trees were recorded during the forest inventory, grouped into 35 species of 19 botanical families. Botanical families. Cedrelinga cateniformis was identified as the most significant species in ecological terms, with an index of ecological The most ecologically significant species was identified as Cedrelinga cateniformis, with an index of importance value of 16.39%, followed by Virola loretensis, with an index of 14.19%. of 14.19%. The data revealed that the highest concentration of trees is found in the intermediate diameter classes. The data r...