We analyze the contribution of the Agulhas Current on the central water masses of the Benguela upwelling system (BUS) over the last decades in a high-resolution ocean simulation driven by atmospheric reanalysis. The BUS is an Eastern Boundary Upwelling System where upwelling of cold nutrient-rich water favors biomass growth. The two distinct subregions, North and South Benguela, differ in nutrient and oxygen properties of the upwelling water mass. Our analysis indicates that the contribution of Agulhas water to the upwelling is very strong in both subregions. Although the water masses feeding the upwelling have a common origin, their pathways are distinct in both regions. Whereas for the central waters of South Benguela the path is rather direct from where it is formed, the central waters of North Benguela takes a longer route through the equatorial current system. Not only the travel time from the Agulhas Current to the BUS is longer but also the central water mass is twice as old for the northern part when compared to the southern. Our analysis traces the pathways, history, and origin of the central water masses feeding upwelling in the BUS and emphasizes the direct impact of the Agulhas Current on the upwelling region. The variability of that link between the Indian Ocean and the South Atlantic is likely to change the nutrient and oxygen content, as well as temperature and salinity of the water masses in the upwelling region. Plain Language Summary This study investigates the link between two important ocean circulation systems in the South Atlantic-Indian Ocean sector: the Benguela upwelling system (BUS) and the Agulhas Current. In the BUS, located off southwest Africa, cold nutrient-rich water is transported to the surface from deeper layers, leading to high productivity. The BUS has two distinct parts, North Benguela water masses is nutrient rich, and oxygen poor, South Benguela water mass has higher oxygen concentrations. The Agulhas Current, flowing along the southeast coast of Africa, leaks into the South Atlantic Ocean south of the BUS. We assess the contribution of Agulhas water to the water masses in North and South Benguela, the travel time and pathways of the water masses into the upwelling regions. For this purpose, we analyze a global high-resolution ocean simulation. Our analysis reveals that the contribution of Agulhas water is high, in both parts of the BUS. The South Benguela water reach the upwelling region on a short route from the Cape Basin and the Brazil-Malvinas Confluence Zone. The North Benguela water, in contrast, takes a longer way by traveling through the whole South Atlantic. This leads to lower oxygen concentrations in North Benguela.