In March and April 1974, profiles of horizontal currents were measured at several time series stations across the continental shelf and slope near Cape Blanc, Spanish Sahara. These profiles are compared with hydrographic sections made during the same period to produce circulation schemes at different states of upwelling. During the mature state (defined as favorable winds blowing steadily for several days), a dominant single-cell onshore-offshore flow occurs which rotates in the upwelling sense and introduces upwelled water into the surface layers on the outer shelf. A secondary circulation system appears on the slope below the dominant cell, consisting of two oppositely rotating cells; the upper of these two cells rotates in the downwelling sense, and the lower rotates in the upwelling sense. An equatoward maximum of alongshore flow was observed over the outer shelf, and a poleward undercurrent was observed at depths between 200 m and 300 m along the slope. The possibility of topographic modifications as well as modifications by the Mauritanian current was also indicated.