The present study on the variation of aboveground biomass and wood density was conducted in the low hill forest of the Napo/Mazán districts, under concession contracts N° 16-LOR-MAY/CON-MAD-2018-005 and 16-LOR-MAY/CON-MAD 2018-008. The results of the inventory reveal a remarkable diversity, with 58 species, 24 families and 48 genera, highlighting Virolla mollissima as the dominant species with 993 trees (25.4%) and Myristicaceae as the most abundant family, with a total of 1206 trees. The model of Chave et al., (2014) is identified as the most accurate option to estimate aboveground biomass, given its high coefficient of determination (R² = 0.878) and a standard error of estimation (SEE) of 23.11%. A total aboveground biomass of 9290.08 kg/ha was calculated for the area under study, with Eschweilera albiflora being the species that contributes the highest amount of aboveground biomass...