During the periods of April, July, 1970 and July, 1973, océanographic cruises were conducted in order to investigate the variability of the Brazil Current in the region between Cabo de Sao Tomé and Guanabara Bay. The geostrophic model of ocean circulation was applied using the hydrographie data collected during the cruise. From this study, a maximum velocity of 70 cm/sec and a volume trans port of 14 x 10(6) m³/sec were reported. The dynamic topography with reference to the 500 db surface, showed the presence of anticyclonic eddies during the periods of April, 1970, and July, 1973. The thermohaline structure within a meander of the Brazil Current is also presented utilizing the data coming from a continuous salinity and temperature recorder in conection with the data coming from a simultaneous BT section.