Mesoscale eddies play a central role in ocean circulation by redistributing heat, salt, nutrients, and  other biogeochemical properties across a wide range of spatial and temporal scales. In the southwestern Atlantic, Brazil Current1s cyclonic eddies formed near Cape Frio (23°S) have long been associated with coastal upwelling and enhanced biological productivity, yet their offshore evolution and ecological influence remain a topic of constant interest. This study presents an integrated view of the physical dynamics and potential biogeochemical impacts of Cape Frio Eddies (CFEs). First, using satellite altimetry and an automated eddy-tracking algorithm, we characterize the occurrence, propagation, and lifetime of CFEs over nearly three decades. The results reveal that a substantial fraction of these vortices propagates hundreds of kilometers southwestward along the Brazil Current, maintaining coherent structures for several months. Larger eddies tend to propagate farther and exhibit longer lifetimes, suggesting their ability to transport physical and biogeochemical properties well beyond their formation region. Second, we combine satellite ocean-color observations with ocean reanalysis and numerical simulations to investigate the interaction between propagating CFEs and the coastal ocean. Preliminary analyses indicate that these eddies entrain chlorophyll-rich coastal waters during their propagation, producing persistent positive chlorophyll anomalies that cannot be explained only by local upwelling. These findings suggest that lateral transport by mesoscale eddies constitutes an important mechanism connecting the productive continental shelf with the oligotrophic offshore Brazil Current. Finally, we present the conceptual framework for an ongoing modeling study aimed at quantifying the physical mechanisms responsible for coastal water entrainment and their influence on nutrient transport and primary productivity. High-resolution CROCO simulations will be used to investigate how mesoscale dynamics interact with submesoscale processes to regulate tracer transport, vertical exchanges, and ecosystem variability. Together, these results highlight Cape Frio Eddies as important agents of cross-scale physical–biogeochemical coupling in the southwestern Atlantic, linking coastal and open-ocean environments through the transport of water masses and biologically relevant tracers.