Between 24 July and 10 September 1964, low sea-surface salinity was present off South America between 5°N and 100°N in the form of two partly merged tongues extending more than 600 n. mi. east of 50°W. Near 9°N, 50°W, a marked eastward flow was found and identified as the Equatorial Counter Current; it apparently brought in much of the freshened water encountered east of 50°W....