The population of 11 key species in the Keo Seima Wildlife Sanctuary (KSWS) were monitored between 2010 — 2020 using line transects. The report shows that populations of green peafowl and pig-tailed macaque are increasing, that populations of black-shanked douc langur, yellow-cheeked crested gibbon, long-tailed macaque, and wild pig are stable, and that populations of Germain’s silvered langur, stump-tailed macaque, and all ungulates except wild pig are decreasing. More than 80% of species trends matched or improved on the anticipated trends set in 2010 in the REDD+ Project Document. These results highlight the success and impacts of the project, while spotlighting where new conservation interventions are most urgently needed.