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The present study focused on determining forest structure and carbon aboveground storage of a forest from the Northern Ecuadorian Amazon. The study site was located at the "Parque Ecologico y Recreacional Lago Agrio (PERLA)" in Lago Agrio, Sucumbíos in Ecuador. We established 10 study transects at 500 m2 to measure trees from the site with dbh (mean diameter at breast height) = 10 cm (D1, 30m). On the trees surveyed, we measured the importance index value (IVI), alpha diversity index, and tree aboveground biomass using allometric models reported for tropical forests. We reported 672 trees ha-1 taxonomically ranked within 25 families, 35 genera and 42 species. The results showed that species with the higher IVI index values included Guarea kunthiana, Inga spp, Nectandra guadaripo, Pourouma minor, Chrysophyllum argenteum; while, for the upper arboreal composition the species included Pourouma minor Vochysia ferruginea y Dussia lehmannii. Furthermore, the alpha diversity index for the arboreal composition was 1392 bits, we thought that this was due to the lack of uniformity in the species distribution within the site. The results also showed a strong correlation between tree biomass and DBH values (p < 0.001; R2 = 0.92). Finally, our results showed that the forest at the PERLA site had 271.5 Mg ha-1 aboveground biomass and 135.8 Mg ha-1 carbon storage. [ABSTRACT FROM AUTHOR]