The growing pressure on the ecosystems of the Amazon Biome highlights the need for continuous monitoring of vegetation cover, especially in sensitive areas such as Indigenous lands and Agrarian reform settlements. This study aims to identify and analyze forest change trajectories in the municipality of São Félix do Xingu, with an emphasis on the Trincheira Bacajá indigenous lands reservation during the period from 2018 to 2023. Two methodologies using Landsat time series were compared: the LandTrendr algorithm on the Google Earth Engine platform, and annual land cover maps from the MapBiomas project. Despite differences in sensitivity and detection criteria, both approaches revealed consistent spatial patterns of vegetation suppression, with over 91.8% overlap in identified disturbance areas. The comparison between the methodologies showed that, although they differ in sensitivity and detection criteria, both identify consistent patterns of forest suppression areas in the region. LandTrendr enables a more detailed analysis, while the MapBiomas-based approach is more straightforward. The high spatial convergence of the results reinforces the importance of integrating multiple approaches for forest monitoring in Indigenous territories and land reform settlements, contributing to the support of public policies aimed at conservation and environmental protection.