Two inverted echo sounders have been deployed for approximately 8 months in the region of the confluence of western boundary currents in the South Atlantic (37¿58.7'S, 51 ¿56.4'W, and 37¿29.3'S, 53¿49.3 S). The confluence of the subtropical Brazil Current with the sub-Antarctic Malvinas Current creates a strong, sharp thermohaline front. From the time series obtained with the sounders, two parameters are obtained and analyzed: dynamic height from the surface relative to 800 m and the position of the front. The time series of dynamic height indicates the presence of a cold intrusion during November, the southward extension of the Brazil Current and northward extension of the Malvinas Current during January, and a simultaneous warming of the area at both moored locations (0.04 dyn m/month) from March through June. From the dynamic height time series, mean geostrophic velocities are calculated. The mean value from mid-December through mid-June is - 14 cm/s, representative of an average southward transport of 10 ¿ 106 m3/s. The maximum southward transport, 23 ¿ 106 m 3/s, is during January. The front oscillates around its mean position with a period of about 1 month and an amplitude that varies from 10 to 50 km. The velocity of the displacement reaches values up to 10 km/d. Atmospherically forced oscillations are detected in the records. A 21-day oscillation in the time series, obtained with the instrument located on the slope of the continental shelf, is associated with a coastally trapped wind forced response. ¿American Geophysical Union 1987