Amazonian floodplain lakes of South America play an important role in supporting biodiversity and providing essential ecosystem services for riparian human communities. However, Amazonian floodplain lakes can be very dynamic systems, as their location, size, depth, and water conditions are influenced by seasonal changes in water and sediment flows in adjacent rivers, or by other climatic conditions. In recent years, the Amazon has experienced historic droughts, which have likely affected floodplain lakes. In this study, we asked: How has Amazonian floodplain lake area changed over time? We focused on floodplain lakes in the triple border region of Peru, Colombia, and Brazil along the mainstem Amazon during the period 2018-2024. We used high-resolution Planet Basemaps imagery to capture satellite images and ArcGIS Pro to digitize changes in lake area. We also needed to consider the effects of ENSO (El Niño) on Amazonian floodplain dynamics. Our preliminary results indicated variability in floodplain lake area across regions within our study site, with some lakes showing changes in area while others remained stable in size during the same timeframe. These findings are helpful in advancing understanding of hydrological and ecological changes in the Amazon and provide a quantitative baseline for further research on floodplain lakes.